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Finding the Fourth Proportional to 1,115.42, 1,539.21 and 618.08

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Solution

The fourth proportional to 1,115.42, 1,539.21 and 618.08 is: 852.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.42 : 1,539.21 = 618.08 : x
  2. Step 2: Convert to fraction form
    1,115.42/1,539.21 = 618.08/x
  3. Step 3: Cross multiply
    1,115.42x = 1,539.21 × 618.08
  4. Step 4: Simplify right side
    1,115.42x = 951,354.92
  5. Step 5: Solve for x
    x = 951,354.92/1,115.42
  6. Step 6: Final answer
    x = 852.91

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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.