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Finding the Fourth Proportional to 939.88, 1,404.09 and 747.72

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Solution

The fourth proportional to 939.88, 1,404.09 and 747.72 is: 1,117.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.88 : 1,404.09 = 747.72 : x
  2. Step 2: Convert to fraction form
    939.88/1,404.09 = 747.72/x
  3. Step 3: Cross multiply
    939.88x = 1,404.09 × 747.72
  4. Step 4: Simplify right side
    939.88x = 1,049,866.17
  5. Step 5: Solve for x
    x = 1,049,866.17/939.88
  6. Step 6: Final answer
    x = 1,117.02

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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.