Home / 20,385.49-28,133.13-15,340.66

Finding the Fourth Proportional to 20,385.49, 28,133.13 and 15,340.66

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Solution

The fourth proportional to 20,385.49, 28,133.13 and 15,340.66 is: 21,170.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.49 : 28,133.13 = 15,340.66 : x
  2. Step 2: Convert to fraction form
    20,385.49/28,133.13 = 15,340.66/x
  3. Step 3: Cross multiply
    20,385.49x = 28,133.13 × 15,340.66
  4. Step 4: Simplify right side
    20,385.49x = 431,580,782.07
  5. Step 5: Solve for x
    x = 431,580,782.07/20,385.49
  6. Step 6: Final answer
    x = 21,170.98

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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.