Home / 90,730.15-135,931.20-55,628.80

Finding the Fourth Proportional to 90,730.15, 135,931.20 and 55,628.80

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Solution

The fourth proportional to 90,730.15, 135,931.20 and 55,628.80 is: 83,342.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,730.15 : 135,931.20 = 55,628.80 : x
  2. Step 2: Convert to fraction form
    90,730.15/135,931.20 = 55,628.80/x
  3. Step 3: Cross multiply
    90,730.15x = 135,931.20 × 55,628.80
  4. Step 4: Simplify right side
    90,730.15x = 7,561,689,538.56
  5. Step 5: Solve for x
    x = 7,561,689,538.56/90,730.15
  6. Step 6: Final answer
    x = 83,342.63

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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.