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Finding the Fourth Proportional to 124,286.80, 186,430.20 and 90,461.20

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Solution

The fourth proportional to 124,286.80, 186,430.20 and 90,461.20 is: 135,691.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,286.80 : 186,430.20 = 90,461.20 : x
  2. Step 2: Convert to fraction form
    124,286.80/186,430.20 = 90,461.20/x
  3. Step 3: Cross multiply
    124,286.80x = 186,430.20 × 90,461.20
  4. Step 4: Simplify right side
    124,286.80x = 16,864,699,608.24
  5. Step 5: Solve for x
    x = 16,864,699,608.24/124,286.80
  6. Step 6: Final answer
    x = 135,691.80

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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.