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Finding the Fourth Proportional to 18,478.31, 25,490.93 and 10,920.98

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Solution

The fourth proportional to 18,478.31, 25,490.93 and 10,920.98 is: 15,065.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,478.31 : 25,490.93 = 10,920.98 : x
  2. Step 2: Convert to fraction form
    18,478.31/25,490.93 = 10,920.98/x
  3. Step 3: Cross multiply
    18,478.31x = 25,490.93 × 10,920.98
  4. Step 4: Simplify right side
    18,478.31x = 278,385,945.83
  5. Step 5: Solve for x
    x = 278,385,945.83/18,478.31
  6. Step 6: Final answer
    x = 15,065.56

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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.