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Finding the Fourth Proportional to 90,963.60, 136,445.40 and 68,656.20

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Solution

The fourth proportional to 90,963.60, 136,445.40 and 68,656.20 is: 102,984.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,963.60 : 136,445.40 = 68,656.20 : x
  2. Step 2: Convert to fraction form
    90,963.60/136,445.40 = 68,656.20/x
  3. Step 3: Cross multiply
    90,963.60x = 136,445.40 × 68,656.20
  4. Step 4: Simplify right side
    90,963.60x = 9,367,822,671.48
  5. Step 5: Solve for x
    x = 9,367,822,671.48/90,963.60
  6. Step 6: Final answer
    x = 102,984.30

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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.