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Finding the Fourth Proportional to 28,112.76, 42,176.43 and 8,390.88

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Solution

The fourth proportional to 28,112.76, 42,176.43 and 8,390.88 is: 12,588.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,112.76 : 42,176.43 = 8,390.88 : x
  2. Step 2: Convert to fraction form
    28,112.76/42,176.43 = 8,390.88/x
  3. Step 3: Cross multiply
    28,112.76x = 42,176.43 × 8,390.88
  4. Step 4: Simplify right side
    28,112.76x = 353,897,362.96
  5. Step 5: Solve for x
    x = 353,897,362.96/28,112.76
  6. Step 6: Final answer
    x = 12,588.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.