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Finding the Fourth Proportional to 750.61, 1,125.90 and 317.47

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Solution

The fourth proportional to 750.61, 1,125.90 and 317.47 is: 476.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.61 : 1,125.90 = 317.47 : x
  2. Step 2: Convert to fraction form
    750.61/1,125.90 = 317.47/x
  3. Step 3: Cross multiply
    750.61x = 1,125.90 × 317.47
  4. Step 4: Simplify right side
    750.61x = 357,439.47
  5. Step 5: Solve for x
    x = 357,439.47/750.61
  6. Step 6: Final answer
    x = 476.20

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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.