Home / 15,789.52-21,789-8,715.28

Finding the Fourth Proportional to 15,789.52, 21,789 and 8,715.28

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Solution

The fourth proportional to 15,789.52, 21,789 and 8,715.28 is: 12,026.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.52 : 21,789 = 8,715.28 : x
  2. Step 2: Convert to fraction form
    15,789.52/21,789 = 8,715.28/x
  3. Step 3: Cross multiply
    15,789.52x = 21,789 × 8,715.28
  4. Step 4: Simplify right side
    15,789.52x = 189,897,235.92
  5. Step 5: Solve for x
    x = 189,897,235.92/15,789.52
  6. Step 6: Final answer
    x = 12,026.79

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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.