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Finding the Fourth Proportional to 866.91, 1,299.28 and 434.19

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Solution

The fourth proportional to 866.91, 1,299.28 and 434.19 is: 650.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.91 : 1,299.28 = 434.19 : x
  2. Step 2: Convert to fraction form
    866.91/1,299.28 = 434.19/x
  3. Step 3: Cross multiply
    866.91x = 1,299.28 × 434.19
  4. Step 4: Simplify right side
    866.91x = 564,134.38
  5. Step 5: Solve for x
    x = 564,134.38/866.91
  6. Step 6: Final answer
    x = 650.74

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.