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Finding the Fourth Proportional to 18,699, 28,007.29 and 15,456.48

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Solution

The fourth proportional to 18,699, 28,007.29 and 15,456.48 is: 23,150.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,699 : 28,007.29 = 15,456.48 : x
  2. Step 2: Convert to fraction form
    18,699/28,007.29 = 15,456.48/x
  3. Step 3: Cross multiply
    18,699x = 28,007.29 × 15,456.48
  4. Step 4: Simplify right side
    18,699x = 432,894,117.74
  5. Step 5: Solve for x
    x = 432,894,117.74/18,699
  6. Step 6: Final answer
    x = 23,150.66

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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.