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Finding the Fourth Proportional to 15,138.60, 20,890.80 and 8,424.24

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Solution

The fourth proportional to 15,138.60, 20,890.80 and 8,424.24 is: 11,625.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.60 : 20,890.80 = 8,424.24 : x
  2. Step 2: Convert to fraction form
    15,138.60/20,890.80 = 8,424.24/x
  3. Step 3: Cross multiply
    15,138.60x = 20,890.80 × 8,424.24
  4. Step 4: Simplify right side
    15,138.60x = 175,989,112.99
  5. Step 5: Solve for x
    x = 175,989,112.99/15,138.60
  6. Step 6: Final answer
    x = 11,625.19

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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.