Home / 90,991.28-136,439.40-28,645.04

Finding the Fourth Proportional to 90,991.28, 136,439.40 and 28,645.04

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Solution

The fourth proportional to 90,991.28, 136,439.40 and 28,645.04 is: 42,952.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,991.28 : 136,439.40 = 28,645.04 : x
  2. Step 2: Convert to fraction form
    90,991.28/136,439.40 = 28,645.04/x
  3. Step 3: Cross multiply
    90,991.28x = 136,439.40 × 28,645.04
  4. Step 4: Simplify right side
    90,991.28x = 3,908,312,070.58
  5. Step 5: Solve for x
    x = 3,908,312,070.58/90,991.28
  6. Step 6: Final answer
    x = 42,952.60

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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.