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Finding the Fourth Proportional to 84,480.30, 126,720.45 and 78,903.45

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Solution

The fourth proportional to 84,480.30, 126,720.45 and 78,903.45 is: 118,355.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,480.30 : 126,720.45 = 78,903.45 : x
  2. Step 2: Convert to fraction form
    84,480.30/126,720.45 = 78,903.45/x
  3. Step 3: Cross multiply
    84,480.30x = 126,720.45 × 78,903.45
  4. Step 4: Simplify right side
    84,480.30x = 9,998,680,690.55
  5. Step 5: Solve for x
    x = 9,998,680,690.55/84,480.30
  6. Step 6: Final answer
    x = 118,355.18

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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.