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Finding the Fourth Proportional to 939.70, 1,407.72 and 724.64

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Solution

The fourth proportional to 939.70, 1,407.72 and 724.64 is: 1,085.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.70 : 1,407.72 = 724.64 : x
  2. Step 2: Convert to fraction form
    939.70/1,407.72 = 724.64/x
  3. Step 3: Cross multiply
    939.70x = 1,407.72 × 724.64
  4. Step 4: Simplify right side
    939.70x = 1,020,090.22
  5. Step 5: Solve for x
    x = 1,020,090.22/939.70
  6. Step 6: Final answer
    x = 1,085.55

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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.