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Finding the Fourth Proportional to 712.56, 1,069.07 and 387.70

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Solution

The fourth proportional to 712.56, 1,069.07 and 387.70 is: 581.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.56 : 1,069.07 = 387.70 : x
  2. Step 2: Convert to fraction form
    712.56/1,069.07 = 387.70/x
  3. Step 3: Cross multiply
    712.56x = 1,069.07 × 387.70
  4. Step 4: Simplify right side
    712.56x = 414,483.11
  5. Step 5: Solve for x
    x = 414,483.11/712.56
  6. Step 6: Final answer
    x = 581.68

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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.