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Finding the Fourth Proportional to 90,987.60, 136,481.40 and 83,114.40

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Solution

The fourth proportional to 90,987.60, 136,481.40 and 83,114.40 is: 124,671.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,987.60 : 136,481.40 = 83,114.40 : x
  2. Step 2: Convert to fraction form
    90,987.60/136,481.40 = 83,114.40/x
  3. Step 3: Cross multiply
    90,987.60x = 136,481.40 × 83,114.40
  4. Step 4: Simplify right side
    90,987.60x = 11,343,569,672.16
  5. Step 5: Solve for x
    x = 11,343,569,672.16/90,987.60
  6. Step 6: Final answer
    x = 124,671.60

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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.