Home / 100,890.10-151,335.15-90,003.70

Finding the Fourth Proportional to 100,890.10, 151,335.15 and 90,003.70

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Solution

The fourth proportional to 100,890.10, 151,335.15 and 90,003.70 is: 135,005.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,890.10 : 151,335.15 = 90,003.70 : x
  2. Step 2: Convert to fraction form
    100,890.10/151,335.15 = 90,003.70/x
  3. Step 3: Cross multiply
    100,890.10x = 151,335.15 × 90,003.70
  4. Step 4: Simplify right side
    100,890.10x = 13,620,723,440.06
  5. Step 5: Solve for x
    x = 13,620,723,440.06/100,890.10
  6. Step 6: Final answer
    x = 135,005.55

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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.