Home / 89,860.20-134,612.10-78,779.40

Finding the Fourth Proportional to 89,860.20, 134,612.10 and 78,779.40

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Solution

The fourth proportional to 89,860.20, 134,612.10 and 78,779.40 is: 118,012.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,860.20 : 134,612.10 = 78,779.40 : x
  2. Step 2: Convert to fraction form
    89,860.20/134,612.10 = 78,779.40/x
  3. Step 3: Cross multiply
    89,860.20x = 134,612.10 × 78,779.40
  4. Step 4: Simplify right side
    89,860.20x = 10,604,660,470.74
  5. Step 5: Solve for x
    x = 10,604,660,470.74/89,860.20
  6. Step 6: Final answer
    x = 118,012.87

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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.