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Finding the Fourth Proportional to 740.88, 1,108.71 and 639.45

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Solution

The fourth proportional to 740.88, 1,108.71 and 639.45 is: 956.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.88 : 1,108.71 = 639.45 : x
  2. Step 2: Convert to fraction form
    740.88/1,108.71 = 639.45/x
  3. Step 3: Cross multiply
    740.88x = 1,108.71 × 639.45
  4. Step 4: Simplify right side
    740.88x = 708,964.61
  5. Step 5: Solve for x
    x = 708,964.61/740.88
  6. Step 6: Final answer
    x = 956.92

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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.