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Finding the Fourth Proportional to 836.31, 1,154.31 and 487.20

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Solution

The fourth proportional to 836.31, 1,154.31 and 487.20 is: 672.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.31 : 1,154.31 = 487.20 : x
  2. Step 2: Convert to fraction form
    836.31/1,154.31 = 487.20/x
  3. Step 3: Cross multiply
    836.31x = 1,154.31 × 487.20
  4. Step 4: Simplify right side
    836.31x = 562,379.83
  5. Step 5: Solve for x
    x = 562,379.83/836.31
  6. Step 6: Final answer
    x = 672.45

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Double scale
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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.