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Finding the Fourth Proportional to 688.02, 1,026.31 and 646.10

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Solution

The fourth proportional to 688.02, 1,026.31 and 646.10 is: 963.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.02 : 1,026.31 = 646.10 : x
  2. Step 2: Convert to fraction form
    688.02/1,026.31 = 646.10/x
  3. Step 3: Cross multiply
    688.02x = 1,026.31 × 646.10
  4. Step 4: Simplify right side
    688.02x = 663,098.89
  5. Step 5: Solve for x
    x = 663,098.89/688.02
  6. Step 6: Final answer
    x = 963.78

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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.