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Finding the Fourth Proportional to 939.92, 1,297.50 and 591.08

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Solution

The fourth proportional to 939.92, 1,297.50 and 591.08 is: 815.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.92 : 1,297.50 = 591.08 : x
  2. Step 2: Convert to fraction form
    939.92/1,297.50 = 591.08/x
  3. Step 3: Cross multiply
    939.92x = 1,297.50 × 591.08
  4. Step 4: Simplify right side
    939.92x = 766,926.30
  5. Step 5: Solve for x
    x = 766,926.30/939.92
  6. Step 6: Final answer
    x = 815.95

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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.