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Finding the Fourth Proportional to 26,687, 36,831.30 and 15,509

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Solution

The fourth proportional to 26,687, 36,831.30 and 15,509 is: 21,404.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,687 : 36,831.30 = 15,509 : x
  2. Step 2: Convert to fraction form
    26,687/36,831.30 = 15,509/x
  3. Step 3: Cross multiply
    26,687x = 36,831.30 × 15,509
  4. Step 4: Simplify right side
    26,687x = 571,216,631.70
  5. Step 5: Solve for x
    x = 571,216,631.70/26,687
  6. Step 6: Final answer
    x = 21,404.30

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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.