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Finding the Fourth Proportional to 83,420.40, 125,422.20 and 81,670.80

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Solution

The fourth proportional to 83,420.40, 125,422.20 and 81,670.80 is: 122,791.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,420.40 : 125,422.20 = 81,670.80 : x
  2. Step 2: Convert to fraction form
    83,420.40/125,422.20 = 81,670.80/x
  3. Step 3: Cross multiply
    83,420.40x = 125,422.20 × 81,670.80
  4. Step 4: Simplify right side
    83,420.40x = 10,243,331,411.76
  5. Step 5: Solve for x
    x = 10,243,331,411.76/83,420.40
  6. Step 6: Final answer
    x = 122,791.68

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1.5x scale

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.