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Finding the Fourth Proportional to 1,115.64, 1,539.50 and 649.80

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Solution

The fourth proportional to 1,115.64, 1,539.50 and 649.80 is: 896.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.64 : 1,539.50 = 649.80 : x
  2. Step 2: Convert to fraction form
    1,115.64/1,539.50 = 649.80/x
  3. Step 3: Cross multiply
    1,115.64x = 1,539.50 × 649.80
  4. Step 4: Simplify right side
    1,115.64x = 1,000,367.10
  5. Step 5: Solve for x
    x = 1,000,367.10/1,115.64
  6. Step 6: Final answer
    x = 896.68

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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.