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Finding the Fourth Proportional to 90,620.90, 135,931.35 and 82,456.10

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Solution

The fourth proportional to 90,620.90, 135,931.35 and 82,456.10 is: 123,684.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,620.90 : 135,931.35 = 82,456.10 : x
  2. Step 2: Convert to fraction form
    90,620.90/135,931.35 = 82,456.10/x
  3. Step 3: Cross multiply
    90,620.90x = 135,931.35 × 82,456.10
  4. Step 4: Simplify right side
    90,620.90x = 11,208,368,988.74
  5. Step 5: Solve for x
    x = 11,208,368,988.74/90,620.90
  6. Step 6: Final answer
    x = 123,684.15

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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.