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Finding the Fourth Proportional to 1,115.95, 1,539.97 and 673.77

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Solution

The fourth proportional to 1,115.95, 1,539.97 and 673.77 is: 929.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.95 : 1,539.97 = 673.77 : x
  2. Step 2: Convert to fraction form
    1,115.95/1,539.97 = 673.77/x
  3. Step 3: Cross multiply
    1,115.95x = 1,539.97 × 673.77
  4. Step 4: Simplify right side
    1,115.95x = 1,037,585.59
  5. Step 5: Solve for x
    x = 1,037,585.59/1,115.95
  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.