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Finding the Fourth Proportional to 81,010.60, 121,515.90 and 76,417.90

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Solution

The fourth proportional to 81,010.60, 121,515.90 and 76,417.90 is: 114,626.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,010.60 : 121,515.90 = 76,417.90 : x
  2. Step 2: Convert to fraction form
    81,010.60/121,515.90 = 76,417.90/x
  3. Step 3: Cross multiply
    81,010.60x = 121,515.90 × 76,417.90
  4. Step 4: Simplify right side
    81,010.60x = 9,285,989,894.61
  5. Step 5: Solve for x
    x = 9,285,989,894.61/81,010.60
  6. Step 6: Final answer
    x = 114,626.85

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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.