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Finding the Fourth Proportional to 71,221.98, 106,831.80 and 21,302.40

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Solution

The fourth proportional to 71,221.98, 106,831.80 and 21,302.40 is: 31,953.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,221.98 : 106,831.80 = 21,302.40 : x
  2. Step 2: Convert to fraction form
    71,221.98/106,831.80 = 21,302.40/x
  3. Step 3: Cross multiply
    71,221.98x = 106,831.80 × 21,302.40
  4. Step 4: Simplify right side
    71,221.98x = 2,275,773,736.32
  5. Step 5: Solve for x
    x = 2,275,773,736.32/71,221.98
  6. Step 6: Final answer
    x = 31,953.25

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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.