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Finding the Fourth Proportional to 123,640.80, 185,461.20 and 79,354.05

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Solution

The fourth proportional to 123,640.80, 185,461.20 and 79,354.05 is: 119,031.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,640.80 : 185,461.20 = 79,354.05 : x
  2. Step 2: Convert to fraction form
    123,640.80/185,461.20 = 79,354.05/x
  3. Step 3: Cross multiply
    123,640.80x = 185,461.20 × 79,354.05
  4. Step 4: Simplify right side
    123,640.80x = 14,717,097,337.86
  5. Step 5: Solve for x
    x = 14,717,097,337.86/123,640.80
  6. Step 6: Final answer
    x = 119,031.08

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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.