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Finding the Fourth Proportional to 921.47, 1,380.45 and 715.02

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Solution

The fourth proportional to 921.47, 1,380.45 and 715.02 is: 1,071.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.47 : 1,380.45 = 715.02 : x
  2. Step 2: Convert to fraction form
    921.47/1,380.45 = 715.02/x
  3. Step 3: Cross multiply
    921.47x = 1,380.45 × 715.02
  4. Step 4: Simplify right side
    921.47x = 987,049.36
  5. Step 5: Solve for x
    x = 987,049.36/921.47
  6. Step 6: Final answer
    x = 1,071.17

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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.