Home / 78,439.10-117,672.78-28,589.18

Finding the Fourth Proportional to 78,439.10, 117,672.78 and 28,589.18

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Solution

The fourth proportional to 78,439.10, 117,672.78 and 28,589.18 is: 42,888.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,439.10 : 117,672.78 = 28,589.18 : x
  2. Step 2: Convert to fraction form
    78,439.10/117,672.78 = 28,589.18/x
  3. Step 3: Cross multiply
    78,439.10x = 117,672.78 × 28,589.18
  4. Step 4: Simplify right side
    78,439.10x = 3,364,167,700.16
  5. Step 5: Solve for x
    x = 3,364,167,700.16/78,439.10
  6. Step 6: Final answer
    x = 42,888.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.