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Finding the Fourth Proportional to 28,678.54, 39,576.88 and 15,932.88

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Solution

The fourth proportional to 28,678.54, 39,576.88 and 15,932.88 is: 21,987.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,678.54 : 39,576.88 = 15,932.88 : x
  2. Step 2: Convert to fraction form
    28,678.54/39,576.88 = 15,932.88/x
  3. Step 3: Cross multiply
    28,678.54x = 39,576.88 × 15,932.88
  4. Step 4: Simplify right side
    28,678.54x = 630,573,679.81
  5. Step 5: Solve for x
    x = 630,573,679.81/28,678.54
  6. Step 6: Final answer
    x = 21,987.65

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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.