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Finding the Fourth Proportional to 90,465.57, 135,672.42 and 30,487.50

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Solution

The fourth proportional to 90,465.57, 135,672.42 and 30,487.50 is: 45,722.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,465.57 : 135,672.42 = 30,487.50 : x
  2. Step 2: Convert to fraction form
    90,465.57/135,672.42 = 30,487.50/x
  3. Step 3: Cross multiply
    90,465.57x = 135,672.42 × 30,487.50
  4. Step 4: Simplify right side
    90,465.57x = 4,136,312,904.75
  5. Step 5: Solve for x
    x = 4,136,312,904.75/90,465.57
  6. Step 6: Final answer
    x = 45,722.51

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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.