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Finding the Fourth Proportional to 90,672.90, 135,944.55 and 40,712.10

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Solution

The fourth proportional to 90,672.90, 135,944.55 and 40,712.10 is: 61,039.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,672.90 : 135,944.55 = 40,712.10 : x
  2. Step 2: Convert to fraction form
    90,672.90/135,944.55 = 40,712.10/x
  3. Step 3: Cross multiply
    90,672.90x = 135,944.55 × 40,712.10
  4. Step 4: Simplify right side
    90,672.90x = 5,534,588,114.06
  5. Step 5: Solve for x
    x = 5,534,588,114.06/90,672.90
  6. Step 6: Final answer
    x = 61,039.05

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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.