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Finding the Fourth Proportional to 72,661.80, 108,978.30 and 35,221.80

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Solution

The fourth proportional to 72,661.80, 108,978.30 and 35,221.80 is: 52,825.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,661.80 : 108,978.30 = 35,221.80 : x
  2. Step 2: Convert to fraction form
    72,661.80/108,978.30 = 35,221.80/x
  3. Step 3: Cross multiply
    72,661.80x = 108,978.30 × 35,221.80
  4. Step 4: Simplify right side
    72,661.80x = 3,838,411,886.94
  5. Step 5: Solve for x
    x = 3,838,411,886.94/72,661.80
  6. Step 6: Final answer
    x = 52,825.72

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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.