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Finding the Fourth Proportional to 28,000.78, 38,641.54 and 15,425.54

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Solution

The fourth proportional to 28,000.78, 38,641.54 and 15,425.54 is: 21,287.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,000.78 : 38,641.54 = 15,425.54 : x
  2. Step 2: Convert to fraction form
    28,000.78/38,641.54 = 15,425.54/x
  3. Step 3: Cross multiply
    28,000.78x = 38,641.54 × 15,425.54
  4. Step 4: Simplify right side
    28,000.78x = 596,066,620.93
  5. Step 5: Solve for x
    x = 596,066,620.93/28,000.78
  6. Step 6: Final answer
    x = 21,287.50

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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.