Home / 28,390.24-39,178.08-15,815.20

Finding the Fourth Proportional to 28,390.24, 39,178.08 and 15,815.20

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Solution

The fourth proportional to 28,390.24, 39,178.08 and 15,815.20 is: 21,824.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,390.24 : 39,178.08 = 15,815.20 : x
  2. Step 2: Convert to fraction form
    28,390.24/39,178.08 = 15,815.20/x
  3. Step 3: Cross multiply
    28,390.24x = 39,178.08 × 15,815.20
  4. Step 4: Simplify right side
    28,390.24x = 619,609,170.82
  5. Step 5: Solve for x
    x = 619,609,170.82/28,390.24
  6. Step 6: Final answer
    x = 21,824.72

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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.