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Finding the Fourth Proportional to 90,698.80, 136,069.80 and 38,081.20

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Solution

The fourth proportional to 90,698.80, 136,069.80 and 38,081.20 is: 57,130.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,698.80 : 136,069.80 = 38,081.20 : x
  2. Step 2: Convert to fraction form
    90,698.80/136,069.80 = 38,081.20/x
  3. Step 3: Cross multiply
    90,698.80x = 136,069.80 × 38,081.20
  4. Step 4: Simplify right side
    90,698.80x = 5,181,701,267.76
  5. Step 5: Solve for x
    x = 5,181,701,267.76/90,698.80
  6. Step 6: Final answer
    x = 57,130.87

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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.