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Finding the Fourth Proportional to 26,657, 36,789.90 and 15,479

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Solution

The fourth proportional to 26,657, 36,789.90 and 15,479 is: 21,362.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,657 : 36,789.90 = 15,479 : x
  2. Step 2: Convert to fraction form
    26,657/36,789.90 = 15,479/x
  3. Step 3: Cross multiply
    26,657x = 36,789.90 × 15,479
  4. Step 4: Simplify right side
    26,657x = 569,470,862.10
  5. Step 5: Solve for x
    x = 569,470,862.10/26,657
  6. Step 6: Final answer
    x = 21,362.90

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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.