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Finding the Fourth Proportional to 18,870.47, 28,309.12 and 15,391.31

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Solution

The fourth proportional to 18,870.47, 28,309.12 and 15,391.31 is: 23,089.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.47 : 28,309.12 = 15,391.31 : x
  2. Step 2: Convert to fraction form
    18,870.47/28,309.12 = 15,391.31/x
  3. Step 3: Cross multiply
    18,870.47x = 28,309.12 × 15,391.31
  4. Step 4: Simplify right side
    18,870.47x = 435,714,474.04
  5. Step 5: Solve for x
    x = 435,714,474.04/18,870.47
  6. Step 6: Final answer
    x = 23,089.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.