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Finding the Fourth Proportional to 72,801.20, 109,201.80 and 43,203.80

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Solution

The fourth proportional to 72,801.20, 109,201.80 and 43,203.80 is: 64,805.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,801.20 : 109,201.80 = 43,203.80 : x
  2. Step 2: Convert to fraction form
    72,801.20/109,201.80 = 43,203.80/x
  3. Step 3: Cross multiply
    72,801.20x = 109,201.80 × 43,203.80
  4. Step 4: Simplify right side
    72,801.20x = 4,717,932,726.84
  5. Step 5: Solve for x
    x = 4,717,932,726.84/72,801.20
  6. Step 6: Final answer
    x = 64,805.70

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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.