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Finding the Fourth Proportional to 18,910.13, 28,345.95 and 7,822.85

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Solution

The fourth proportional to 18,910.13, 28,345.95 and 7,822.85 is: 11,726.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.13 : 28,345.95 = 7,822.85 : x
  2. Step 2: Convert to fraction form
    18,910.13/28,345.95 = 7,822.85/x
  3. Step 3: Cross multiply
    18,910.13x = 28,345.95 × 7,822.85
  4. Step 4: Simplify right side
    18,910.13x = 221,745,973.23
  5. Step 5: Solve for x
    x = 221,745,973.23/18,910.13
  6. Step 6: Final answer
    x = 11,726.31

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1.5x scale

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.