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Finding the Fourth Proportional to 836.76, 1,155.08 and 487.36

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Solution

The fourth proportional to 836.76, 1,155.08 and 487.36 is: 672.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.76 : 1,155.08 = 487.36 : x
  2. Step 2: Convert to fraction form
    836.76/1,155.08 = 487.36/x
  3. Step 3: Cross multiply
    836.76x = 1,155.08 × 487.36
  4. Step 4: Simplify right side
    836.76x = 562,939.79
  5. Step 5: Solve for x
    x = 562,939.79/836.76
  6. Step 6: Final answer
    x = 672.76

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Find fourth proportional to 418.38, 577.54 and 243.68
Half scale
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Double scale
Find fourth proportional to 837.76, 1,156.46 and 488.36
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.