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Finding the Fourth Proportional to 90,019.40, 135,029.10 and 72,523.40

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Solution

The fourth proportional to 90,019.40, 135,029.10 and 72,523.40 is: 108,785.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,019.40 : 135,029.10 = 72,523.40 : x
  2. Step 2: Convert to fraction form
    90,019.40/135,029.10 = 72,523.40/x
  3. Step 3: Cross multiply
    90,019.40x = 135,029.10 × 72,523.40
  4. Step 4: Simplify right side
    90,019.40x = 9,792,769,430.94
  5. Step 5: Solve for x
    x = 9,792,769,430.94/90,019.40
  6. Step 6: Final answer
    x = 108,785.10

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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.