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Finding the Fourth Proportional to 1,108.20, 1,528.74 and 715.62

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Solution

The fourth proportional to 1,108.20, 1,528.74 and 715.62 is: 987.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.20 : 1,528.74 = 715.62 : x
  2. Step 2: Convert to fraction form
    1,108.20/1,528.74 = 715.62/x
  3. Step 3: Cross multiply
    1,108.20x = 1,528.74 × 715.62
  4. Step 4: Simplify right side
    1,108.20x = 1,093,996.92
  5. Step 5: Solve for x
    x = 1,093,996.92/1,108.20
  6. Step 6: Final answer
    x = 987.18

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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.