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Finding the Fourth Proportional to 864.71, 1,193.22 and 491.57

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Solution

The fourth proportional to 864.71, 1,193.22 and 491.57 is: 678.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.71 : 1,193.22 = 491.57 : x
  2. Step 2: Convert to fraction form
    864.71/1,193.22 = 491.57/x
  3. Step 3: Cross multiply
    864.71x = 1,193.22 × 491.57
  4. Step 4: Simplify right side
    864.71x = 586,545.19
  5. Step 5: Solve for x
    x = 586,545.19/864.71
  6. Step 6: Final answer
    x = 678.32

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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.