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Finding the Fourth Proportional to 28,110.70, 42,160.65 and 8,389.90

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Solution

The fourth proportional to 28,110.70, 42,160.65 and 8,389.90 is: 12,583.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,110.70 : 42,160.65 = 8,389.90 : x
  2. Step 2: Convert to fraction form
    28,110.70/42,160.65 = 8,389.90/x
  3. Step 3: Cross multiply
    28,110.70x = 42,160.65 × 8,389.90
  4. Step 4: Simplify right side
    28,110.70x = 353,723,637.44
  5. Step 5: Solve for x
    x = 353,723,637.44/28,110.70
  6. Step 6: Final answer
    x = 12,583.24

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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.