Home / 20,430.20-28,194.87-15,385.52

Finding the Fourth Proportional to 20,430.20, 28,194.87 and 15,385.52

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Solution

The fourth proportional to 20,430.20, 28,194.87 and 15,385.52 is: 21,232.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.20 : 28,194.87 = 15,385.52 : x
  2. Step 2: Convert to fraction form
    20,430.20/28,194.87 = 15,385.52/x
  3. Step 3: Cross multiply
    20,430.20x = 28,194.87 × 15,385.52
  4. Step 4: Simplify right side
    20,430.20x = 433,792,595.31
  5. Step 5: Solve for x
    x = 433,792,595.31/20,430.20
  6. Step 6: Final answer
    x = 21,232.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.