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Finding the Fourth Proportional to 1,008.59, 1,391.92 and 713.95

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Solution

The fourth proportional to 1,008.59, 1,391.92 and 713.95 is: 985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.59 : 1,391.92 = 713.95 : x
  2. Step 2: Convert to fraction form
    1,008.59/1,391.92 = 713.95/x
  3. Step 3: Cross multiply
    1,008.59x = 1,391.92 × 713.95
  4. Step 4: Simplify right side
    1,008.59x = 993,756.02
  5. Step 5: Solve for x
    x = 993,756.02/1,008.59
  6. Step 6: Final answer
    x = 985.30

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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.