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Finding the Fourth Proportional to 18,378.93, 25,362.92 and 10,421.15

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Solution

The fourth proportional to 18,378.93, 25,362.92 and 10,421.15 is: 14,381.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,378.93 : 25,362.92 = 10,421.15 : x
  2. Step 2: Convert to fraction form
    18,378.93/25,362.92 = 10,421.15/x
  3. Step 3: Cross multiply
    18,378.93x = 25,362.92 × 10,421.15
  4. Step 4: Simplify right side
    18,378.93x = 264,310,793.76
  5. Step 5: Solve for x
    x = 264,310,793.76/18,378.93
  6. Step 6: Final answer
    x = 14,381.19

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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.