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Finding the Fourth Proportional to 81,144.90, 121,717.35 and 67,320.90

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Solution

The fourth proportional to 81,144.90, 121,717.35 and 67,320.90 is: 100,981.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,144.90 : 121,717.35 = 67,320.90 : x
  2. Step 2: Convert to fraction form
    81,144.90/121,717.35 = 67,320.90/x
  3. Step 3: Cross multiply
    81,144.90x = 121,717.35 × 67,320.90
  4. Step 4: Simplify right side
    81,144.90x = 8,194,121,547.62
  5. Step 5: Solve for x
    x = 8,194,121,547.62/81,144.90
  6. Step 6: Final answer
    x = 100,981.35

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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.