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Finding the Fourth Proportional to 1,121.92, 1,681.42 and 471.88

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Solution

The fourth proportional to 1,121.92, 1,681.42 and 471.88 is: 707.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.92 : 1,681.42 = 471.88 : x
  2. Step 2: Convert to fraction form
    1,121.92/1,681.42 = 471.88/x
  3. Step 3: Cross multiply
    1,121.92x = 1,681.42 × 471.88
  4. Step 4: Simplify right side
    1,121.92x = 793,428.47
  5. Step 5: Solve for x
    x = 793,428.47/1,121.92
  6. Step 6: Final answer
    x = 707.21

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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.