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Finding the Fourth Proportional to 715.04, 1,072.28 and 390.24

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Solution

The fourth proportional to 715.04, 1,072.28 and 390.24 is: 585.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.04 : 1,072.28 = 390.24 : x
  2. Step 2: Convert to fraction form
    715.04/1,072.28 = 390.24/x
  3. Step 3: Cross multiply
    715.04x = 1,072.28 × 390.24
  4. Step 4: Simplify right side
    715.04x = 418,446.55
  5. Step 5: Solve for x
    x = 418,446.55/715.04
  6. Step 6: Final answer
    x = 585.21

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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.