Home / 90,039.12-135,143.42-45,697.70

Finding the Fourth Proportional to 90,039.12, 135,143.42 and 45,697.70

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Solution

The fourth proportional to 90,039.12, 135,143.42 and 45,697.70 is: 68,589.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,039.12 : 135,143.42 = 45,697.70 : x
  2. Step 2: Convert to fraction form
    90,039.12/135,143.42 = 45,697.70/x
  3. Step 3: Cross multiply
    90,039.12x = 135,143.42 × 45,697.70
  4. Step 4: Simplify right side
    90,039.12x = 6,175,742,559.93
  5. Step 5: Solve for x
    x = 6,175,742,559.93/90,039.12
  6. Step 6: Final answer
    x = 68,589.55

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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.