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Finding the Fourth Proportional to 71,040, 106,580.88 and 21,120.48

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Solution

The fourth proportional to 71,040, 106,580.88 and 21,120.48 is: 31,686.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,040 : 106,580.88 = 21,120.48 : x
  2. Step 2: Convert to fraction form
    71,040/106,580.88 = 21,120.48/x
  3. Step 3: Cross multiply
    71,040x = 106,580.88 × 21,120.48
  4. Step 4: Simplify right side
    71,040x = 2,251,039,344.42
  5. Step 5: Solve for x
    x = 2,251,039,344.42/71,040
  6. Step 6: Final answer
    x = 31,686.93

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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.