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Finding the Fourth Proportional to 1,115.19, 1,539.79 and 742.79

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Solution

The fourth proportional to 1,115.19, 1,539.79 and 742.79 is: 1,025.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.19 : 1,539.79 = 742.79 : x
  2. Step 2: Convert to fraction form
    1,115.19/1,539.79 = 742.79/x
  3. Step 3: Cross multiply
    1,115.19x = 1,539.79 × 742.79
  4. Step 4: Simplify right side
    1,115.19x = 1,143,742.61
  5. Step 5: Solve for x
    x = 1,143,742.61/1,115.19
  6. Step 6: Final answer
    x = 1,025.60

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1.5x scale

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.