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Finding the Fourth Proportional to 91,081.60, 136,622.40 and 85,206.40

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Solution

The fourth proportional to 91,081.60, 136,622.40 and 85,206.40 is: 127,809.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,081.60 : 136,622.40 = 85,206.40 : x
  2. Step 2: Convert to fraction form
    91,081.60/136,622.40 = 85,206.40/x
  3. Step 3: Cross multiply
    91,081.60x = 136,622.40 × 85,206.40
  4. Step 4: Simplify right side
    91,081.60x = 11,641,102,863.36
  5. Step 5: Solve for x
    x = 11,641,102,863.36/91,081.60
  6. Step 6: Final answer
    x = 127,809.60

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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.