Home / 89,862.20-134,615.10-78,781.40

Finding the Fourth Proportional to 89,862.20, 134,615.10 and 78,781.40

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Solution

The fourth proportional to 89,862.20, 134,615.10 and 78,781.40 is: 118,015.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,862.20 : 134,615.10 = 78,781.40 : x
  2. Step 2: Convert to fraction form
    89,862.20/134,615.10 = 78,781.40/x
  3. Step 3: Cross multiply
    89,862.20x = 134,615.10 × 78,781.40
  4. Step 4: Simplify right side
    89,862.20x = 10,605,166,039.14
  5. Step 5: Solve for x
    x = 10,605,166,039.14/89,862.20
  6. Step 6: Final answer
    x = 118,015.87

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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.