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Finding the Fourth Proportional to 64,728, 89,326.80 and 39,572.64

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Solution

The fourth proportional to 64,728, 89,326.80 and 39,572.64 is: 54,611.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,728 : 89,326.80 = 39,572.64 : x
  2. Step 2: Convert to fraction form
    64,728/89,326.80 = 39,572.64/x
  3. Step 3: Cross multiply
    64,728x = 89,326.80 × 39,572.64
  4. Step 4: Simplify right side
    64,728x = 3,534,897,298.75
  5. Step 5: Solve for x
    x = 3,534,897,298.75/64,728
  6. Step 6: Final answer
    x = 54,611.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.