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Finding the Fourth Proportional to 709.47, 1,065.88 and 417.72

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Solution

The fourth proportional to 709.47, 1,065.88 and 417.72 is: 627.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.47 : 1,065.88 = 417.72 : x
  2. Step 2: Convert to fraction form
    709.47/1,065.88 = 417.72/x
  3. Step 3: Cross multiply
    709.47x = 1,065.88 × 417.72
  4. Step 4: Simplify right side
    709.47x = 445,238.35
  5. Step 5: Solve for x
    x = 445,238.35/709.47
  6. Step 6: Final answer
    x = 627.56

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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.