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Finding the Fourth Proportional to 81,808.20, 122,712.30 and 72,622.80

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Solution

The fourth proportional to 81,808.20, 122,712.30 and 72,622.80 is: 108,934.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,808.20 : 122,712.30 = 72,622.80 : x
  2. Step 2: Convert to fraction form
    81,808.20/122,712.30 = 72,622.80/x
  3. Step 3: Cross multiply
    81,808.20x = 122,712.30 × 72,622.80
  4. Step 4: Simplify right side
    81,808.20x = 8,911,710,820.44
  5. Step 5: Solve for x
    x = 8,911,710,820.44/81,808.20
  6. Step 6: Final answer
    x = 108,934.20

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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.