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Finding the Fourth Proportional to 81,987.80, 122,981.69 and 46,902.85

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Solution

The fourth proportional to 81,987.80, 122,981.69 and 46,902.85 is: 70,354.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,987.80 : 122,981.69 = 46,902.85 : x
  2. Step 2: Convert to fraction form
    81,987.80/122,981.69 = 46,902.85/x
  3. Step 3: Cross multiply
    81,987.80x = 122,981.69 × 46,902.85
  4. Step 4: Simplify right side
    81,987.80x = 5,768,191,568.62
  5. Step 5: Solve for x
    x = 5,768,191,568.62/81,987.80
  6. Step 6: Final answer
    x = 70,354.27

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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.