Home / 28,078.09-38,747.16-15,330.78

Finding the Fourth Proportional to 28,078.09, 38,747.16 and 15,330.78

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Solution

The fourth proportional to 28,078.09, 38,747.16 and 15,330.78 is: 21,156.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.09 : 38,747.16 = 15,330.78 : x
  2. Step 2: Convert to fraction form
    28,078.09/38,747.16 = 15,330.78/x
  3. Step 3: Cross multiply
    28,078.09x = 38,747.16 × 15,330.78
  4. Step 4: Simplify right side
    28,078.09x = 594,024,185.58
  5. Step 5: Solve for x
    x = 594,024,185.58/28,078.09
  6. Step 6: Final answer
    x = 21,156.15

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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.