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Finding the Fourth Proportional to 90,585.40, 135,268.12 and 73,978.40

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Solution

The fourth proportional to 90,585.40, 135,268.12 and 73,978.40 is: 110,469.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,585.40 : 135,268.12 = 73,978.40 : x
  2. Step 2: Convert to fraction form
    90,585.40/135,268.12 = 73,978.40/x
  3. Step 3: Cross multiply
    90,585.40x = 135,268.12 × 73,978.40
  4. Step 4: Simplify right side
    90,585.40x = 10,006,919,088.61
  5. Step 5: Solve for x
    x = 10,006,919,088.61/90,585.40
  6. Step 6: Final answer
    x = 110,469.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.