Home / 20,815.78-28,726.53-11,864.65

Finding the Fourth Proportional to 20,815.78, 28,726.53 and 11,864.65

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Solution

The fourth proportional to 20,815.78, 28,726.53 and 11,864.65 is: 16,373.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.78 : 28,726.53 = 11,864.65 : x
  2. Step 2: Convert to fraction form
    20,815.78/28,726.53 = 11,864.65/x
  3. Step 3: Cross multiply
    20,815.78x = 28,726.53 × 11,864.65
  4. Step 4: Simplify right side
    20,815.78x = 340,830,224.16
  5. Step 5: Solve for x
    x = 340,830,224.16/20,815.78
  6. Step 6: Final answer
    x = 16,373.65

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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.