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Finding the Fourth Proportional to 128,151.48, 192,042.90 and 72,630.20

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Solution

The fourth proportional to 128,151.48, 192,042.90 and 72,630.20 is: 108,840.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,151.48 : 192,042.90 = 72,630.20 : x
  2. Step 2: Convert to fraction form
    128,151.48/192,042.90 = 72,630.20/x
  3. Step 3: Cross multiply
    128,151.48x = 192,042.90 × 72,630.20
  4. Step 4: Simplify right side
    128,151.48x = 13,948,114,235.58
  5. Step 5: Solve for x
    x = 13,948,114,235.58/128,151.48
  6. Step 6: Final answer
    x = 108,840.84

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1.5x scale

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.