Home / 81,780.07-122,670.10-21,808.75

Finding the Fourth Proportional to 81,780.07, 122,670.10 and 21,808.75

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Solution

The fourth proportional to 81,780.07, 122,670.10 and 21,808.75 is: 32,713.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,780.07 : 122,670.10 = 21,808.75 : x
  2. Step 2: Convert to fraction form
    81,780.07/122,670.10 = 21,808.75/x
  3. Step 3: Cross multiply
    81,780.07x = 122,670.10 × 21,808.75
  4. Step 4: Simplify right side
    81,780.07x = 2,675,281,543.38
  5. Step 5: Solve for x
    x = 2,675,281,543.38/81,780.07
  6. Step 6: Final answer
    x = 32,713.12

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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.