Home / 28,390-39,178.20-15,815.56

Finding the Fourth Proportional to 28,390, 39,178.20 and 15,815.56

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Solution

The fourth proportional to 28,390, 39,178.20 and 15,815.56 is: 21,825.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,390 : 39,178.20 = 15,815.56 : x
  2. Step 2: Convert to fraction form
    28,390/39,178.20 = 15,815.56/x
  3. Step 3: Cross multiply
    28,390x = 39,178.20 × 15,815.56
  4. Step 4: Simplify right side
    28,390x = 619,625,172.79
  5. Step 5: Solve for x
    x = 619,625,172.79/28,390
  6. Step 6: Final answer
    x = 21,825.47

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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.