Home / 75,143.20-112,705.08-28,390

Finding the Fourth Proportional to 75,143.20, 112,705.08 and 28,390

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Solution

The fourth proportional to 75,143.20, 112,705.08 and 28,390 is: 42,581.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,143.20 : 112,705.08 = 28,390 : x
  2. Step 2: Convert to fraction form
    75,143.20/112,705.08 = 28,390/x
  3. Step 3: Cross multiply
    75,143.20x = 112,705.08 × 28,390
  4. Step 4: Simplify right side
    75,143.20x = 3,199,697,221.20
  5. Step 5: Solve for x
    x = 3,199,697,221.20/75,143.20
  6. Step 6: Final answer
    x = 42,581.33

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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.