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Finding the Fourth Proportional to 90,817.20, 136,096.20 and 66,938.40

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Solution

The fourth proportional to 90,817.20, 136,096.20 and 66,938.40 is: 100,312.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,817.20 : 136,096.20 = 66,938.40 : x
  2. Step 2: Convert to fraction form
    90,817.20/136,096.20 = 66,938.40/x
  3. Step 3: Cross multiply
    90,817.20x = 136,096.20 × 66,938.40
  4. Step 4: Simplify right side
    90,817.20x = 9,110,061,874.08
  5. Step 5: Solve for x
    x = 9,110,061,874.08/90,817.20
  6. Step 6: Final answer
    x = 100,312.08

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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.