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Finding the Fourth Proportional to 739.68, 1,113.55 and 639.24

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Solution

The fourth proportional to 739.68, 1,113.55 and 639.24 is: 962.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.68 : 1,113.55 = 639.24 : x
  2. Step 2: Convert to fraction form
    739.68/1,113.55 = 639.24/x
  3. Step 3: Cross multiply
    739.68x = 1,113.55 × 639.24
  4. Step 4: Simplify right side
    739.68x = 711,825.70
  5. Step 5: Solve for x
    x = 711,825.70/739.68
  6. Step 6: Final answer
    x = 962.34

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.