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Finding the Fourth Proportional to 90,607.60, 135,911.40 and 86,233.60

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Solution

The fourth proportional to 90,607.60, 135,911.40 and 86,233.60 is: 129,350.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,607.60 : 135,911.40 = 86,233.60 : x
  2. Step 2: Convert to fraction form
    90,607.60/135,911.40 = 86,233.60/x
  3. Step 3: Cross multiply
    90,607.60x = 135,911.40 × 86,233.60
  4. Step 4: Simplify right side
    90,607.60x = 11,720,129,303.04
  5. Step 5: Solve for x
    x = 11,720,129,303.04/90,607.60
  6. Step 6: Final answer
    x = 129,350.40

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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.