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Finding the Fourth Proportional to 836.38, 1,154.20 and 487.30

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Solution

The fourth proportional to 836.38, 1,154.20 and 487.30 is: 672.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.38 : 1,154.20 = 487.30 : x
  2. Step 2: Convert to fraction form
    836.38/1,154.20 = 487.30/x
  3. Step 3: Cross multiply
    836.38x = 1,154.20 × 487.30
  4. Step 4: Simplify right side
    836.38x = 562,434.67
  5. Step 5: Solve for x
    x = 562,434.67/836.38
  6. Step 6: Final answer
    x = 672.47

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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.