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Finding the Fourth Proportional to 72,406.80, 108,901.80 and 64,825.20

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Solution

The fourth proportional to 72,406.80, 108,901.80 and 64,825.20 is: 97,498.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,406.80 : 108,901.80 = 64,825.20 : x
  2. Step 2: Convert to fraction form
    72,406.80/108,901.80 = 64,825.20/x
  3. Step 3: Cross multiply
    72,406.80x = 108,901.80 × 64,825.20
  4. Step 4: Simplify right side
    72,406.80x = 7,059,580,965.36
  5. Step 5: Solve for x
    x = 7,059,580,965.36/72,406.80
  6. Step 6: Final answer
    x = 97,498.87

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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.