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Finding the Fourth Proportional to 709.02, 979.20 and 631.72

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Solution

The fourth proportional to 709.02, 979.20 and 631.72 is: 872.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.02 : 979.20 = 631.72 : x
  2. Step 2: Convert to fraction form
    709.02/979.20 = 631.72/x
  3. Step 3: Cross multiply
    709.02x = 979.20 × 631.72
  4. Step 4: Simplify right side
    709.02x = 618,579.61
  5. Step 5: Solve for x
    x = 618,579.61/709.02
  6. Step 6: Final answer
    x = 872.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.