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Finding the Fourth Proportional to 651.31, 972.31 and 628.52

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Solution

The fourth proportional to 651.31, 972.31 and 628.52 is: 938.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.31 : 972.31 = 628.52 : x
  2. Step 2: Convert to fraction form
    651.31/972.31 = 628.52/x
  3. Step 3: Cross multiply
    651.31x = 972.31 × 628.52
  4. Step 4: Simplify right side
    651.31x = 611,116.28
  5. Step 5: Solve for x
    x = 611,116.28/651.31
  6. Step 6: Final answer
    x = 938.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.