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Finding the Fourth Proportional to 42,775.97, 64,070.42 and 21,679.79

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Solution

The fourth proportional to 42,775.97, 64,070.42 and 21,679.79 is: 32,472.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,775.97 : 64,070.42 = 21,679.79 : x
  2. Step 2: Convert to fraction form
    42,775.97/64,070.42 = 21,679.79/x
  3. Step 3: Cross multiply
    42,775.97x = 64,070.42 × 21,679.79
  4. Step 4: Simplify right side
    42,775.97x = 1,389,032,822.06
  5. Step 5: Solve for x
    x = 1,389,032,822.06/42,775.97
  6. Step 6: Final answer
    x = 32,472.27

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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.