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Finding the Fourth Proportional to 939.62, 1,295.95 and 718.02

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Solution

The fourth proportional to 939.62, 1,295.95 and 718.02 is: 990.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.62 : 1,295.95 = 718.02 : x
  2. Step 2: Convert to fraction form
    939.62/1,295.95 = 718.02/x
  3. Step 3: Cross multiply
    939.62x = 1,295.95 × 718.02
  4. Step 4: Simplify right side
    939.62x = 930,518.02
  5. Step 5: Solve for x
    x = 930,518.02/939.62
  6. Step 6: Final answer
    x = 990.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.