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Finding the Fourth Proportional to 18,708.65, 25,806.71 and 13,666.70

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Solution

The fourth proportional to 18,708.65, 25,806.71 and 13,666.70 is: 18,851.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.65 : 25,806.71 = 13,666.70 : x
  2. Step 2: Convert to fraction form
    18,708.65/25,806.71 = 13,666.70/x
  3. Step 3: Cross multiply
    18,708.65x = 25,806.71 × 13,666.70
  4. Step 4: Simplify right side
    18,708.65x = 352,692,608.88
  5. Step 5: Solve for x
    x = 352,692,608.88/18,708.65
  6. Step 6: Final answer
    x = 18,851.85

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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.