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Finding the Fourth Proportional to 83,808.30, 125,712.45 and 21,478.80

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Solution

The fourth proportional to 83,808.30, 125,712.45 and 21,478.80 is: 32,218.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,808.30 : 125,712.45 = 21,478.80 : x
  2. Step 2: Convert to fraction form
    83,808.30/125,712.45 = 21,478.80/x
  3. Step 3: Cross multiply
    83,808.30x = 125,712.45 × 21,478.80
  4. Step 4: Simplify right side
    83,808.30x = 2,700,152,571.06
  5. Step 5: Solve for x
    x = 2,700,152,571.06/83,808.30
  6. Step 6: Final answer
    x = 32,218.20

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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.