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Finding the Fourth Proportional to 487.08, 672.24 and 290.76

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Solution

The fourth proportional to 487.08, 672.24 and 290.76 is: 401.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.08 : 672.24 = 290.76 : x
  2. Step 2: Convert to fraction form
    487.08/672.24 = 290.76/x
  3. Step 3: Cross multiply
    487.08x = 672.24 × 290.76
  4. Step 4: Simplify right side
    487.08x = 195,460.50
  5. Step 5: Solve for x
    x = 195,460.50/487.08
  6. Step 6: Final answer
    x = 401.29

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Find fourth proportional to 243.54, 336.12 and 145.38
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Double scale
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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.