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Finding the Fourth Proportional to 78,366.60, 117,549.90 and 67,091.40

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Solution

The fourth proportional to 78,366.60, 117,549.90 and 67,091.40 is: 100,637.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,366.60 : 117,549.90 = 67,091.40 : x
  2. Step 2: Convert to fraction form
    78,366.60/117,549.90 = 67,091.40/x
  3. Step 3: Cross multiply
    78,366.60x = 117,549.90 × 67,091.40
  4. Step 4: Simplify right side
    78,366.60x = 7,886,587,360.86
  5. Step 5: Solve for x
    x = 7,886,587,360.86/78,366.60
  6. Step 6: Final answer
    x = 100,637.10

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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.