Home / 90,742.90-135,855.15-81,411.70

Finding the Fourth Proportional to 90,742.90, 135,855.15 and 81,411.70

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Solution

The fourth proportional to 90,742.90, 135,855.15 and 81,411.70 is: 121,885.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,742.90 : 135,855.15 = 81,411.70 : x
  2. Step 2: Convert to fraction form
    90,742.90/135,855.15 = 81,411.70/x
  3. Step 3: Cross multiply
    90,742.90x = 135,855.15 × 81,411.70
  4. Step 4: Simplify right side
    90,742.90x = 11,060,198,715.26
  5. Step 5: Solve for x
    x = 11,060,198,715.26/90,742.90
  6. Step 6: Final answer
    x = 121,885.00

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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.