Home / 90,321.78-135,432.90-31,108.62

Finding the Fourth Proportional to 90,321.78, 135,432.90 and 31,108.62

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Solution

The fourth proportional to 90,321.78, 135,432.90 and 31,108.62 is: 46,645.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,321.78 : 135,432.90 = 31,108.62 : x
  2. Step 2: Convert to fraction form
    90,321.78/135,432.90 = 31,108.62/x
  3. Step 3: Cross multiply
    90,321.78x = 135,432.90 × 31,108.62
  4. Step 4: Simplify right side
    90,321.78x = 4,213,130,621.60
  5. Step 5: Solve for x
    x = 4,213,130,621.60/90,321.78
  6. Step 6: Final answer
    x = 46,645.79

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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.