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Finding the Fourth Proportional to 90,130.60, 135,272.70 and 40,287.40

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Solution

The fourth proportional to 90,130.60, 135,272.70 and 40,287.40 is: 60,465.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,130.60 : 135,272.70 = 40,287.40 : x
  2. Step 2: Convert to fraction form
    90,130.60/135,272.70 = 40,287.40/x
  3. Step 3: Cross multiply
    90,130.60x = 135,272.70 × 40,287.40
  4. Step 4: Simplify right side
    90,130.60x = 5,449,785,373.98
  5. Step 5: Solve for x
    x = 5,449,785,373.98/90,130.60
  6. Step 6: Final answer
    x = 60,465.43

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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.