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Finding the Fourth Proportional to 18,707.45, 25,815.42 and 10,209.20

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Solution

The fourth proportional to 18,707.45, 25,815.42 and 10,209.20 is: 14,088.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,707.45 : 25,815.42 = 10,209.20 : x
  2. Step 2: Convert to fraction form
    18,707.45/25,815.42 = 10,209.20/x
  3. Step 3: Cross multiply
    18,707.45x = 25,815.42 × 10,209.20
  4. Step 4: Simplify right side
    18,707.45x = 263,554,656.79
  5. Step 5: Solve for x
    x = 263,554,656.79/18,707.45
  6. Step 6: Final answer
    x = 14,088.22

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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.