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Finding the Fourth Proportional to 1,115.79, 1,539.05 and 717.59

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Solution

The fourth proportional to 1,115.79, 1,539.05 and 717.59 is: 989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.79 : 1,539.05 = 717.59 : x
  2. Step 2: Convert to fraction form
    1,115.79/1,539.05 = 717.59/x
  3. Step 3: Cross multiply
    1,115.79x = 1,539.05 × 717.59
  4. Step 4: Simplify right side
    1,115.79x = 1,104,395.61
  5. Step 5: Solve for x
    x = 1,104,395.61/1,115.79
  6. Step 6: Final answer
    x = 989.79

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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.