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Finding the Fourth Proportional to 90,612.70, 135,785.40 and 65,705.20

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Solution

The fourth proportional to 90,612.70, 135,785.40 and 65,705.20 is: 98,460.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,612.70 : 135,785.40 = 65,705.20 : x
  2. Step 2: Convert to fraction form
    90,612.70/135,785.40 = 65,705.20/x
  3. Step 3: Cross multiply
    90,612.70x = 135,785.40 × 65,705.20
  4. Step 4: Simplify right side
    90,612.70x = 8,921,806,864.08
  5. Step 5: Solve for x
    x = 8,921,806,864.08/90,612.70
  6. Step 6: Final answer
    x = 98,460.89

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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.