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Finding the Fourth Proportional to 1,115.22, 1,539.70 and 717.06

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Solution

The fourth proportional to 1,115.22, 1,539.70 and 717.06 is: 989.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.22 : 1,539.70 = 717.06 : x
  2. Step 2: Convert to fraction form
    1,115.22/1,539.70 = 717.06/x
  3. Step 3: Cross multiply
    1,115.22x = 1,539.70 × 717.06
  4. Step 4: Simplify right side
    1,115.22x = 1,104,057.28
  5. Step 5: Solve for x
    x = 1,104,057.28/1,115.22
  6. Step 6: Final answer
    x = 989.99

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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.