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Finding the Fourth Proportional to 1,115.86, 1,539.88 and 673.76

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Solution

The fourth proportional to 1,115.86, 1,539.88 and 673.76 is: 929.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.86 : 1,539.88 = 673.76 : x
  2. Step 2: Convert to fraction form
    1,115.86/1,539.88 = 673.76/x
  3. Step 3: Cross multiply
    1,115.86x = 1,539.88 × 673.76
  4. Step 4: Simplify right side
    1,115.86x = 1,037,509.55
  5. Step 5: Solve for x
    x = 1,037,509.55/1,115.86
  6. Step 6: Final answer
    x = 929.78

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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.