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Finding the Fourth Proportional to 18,390, 25,378.20 and 10,006.56

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Solution

The fourth proportional to 18,390, 25,378.20 and 10,006.56 is: 13,809.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390 : 25,378.20 = 10,006.56 : x
  2. Step 2: Convert to fraction form
    18,390/25,378.20 = 10,006.56/x
  3. Step 3: Cross multiply
    18,390x = 25,378.20 × 10,006.56
  4. Step 4: Simplify right side
    18,390x = 253,948,480.99
  5. Step 5: Solve for x
    x = 253,948,480.99/18,390
  6. Step 6: Final answer
    x = 13,809.05

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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.