Home / 15,306.13-21,125.37-9,991.72

Finding the Fourth Proportional to 15,306.13, 21,125.37 and 9,991.72

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Solution

The fourth proportional to 15,306.13, 21,125.37 and 9,991.72 is: 13,790.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,306.13 : 21,125.37 = 9,991.72 : x
  2. Step 2: Convert to fraction form
    15,306.13/21,125.37 = 9,991.72/x
  3. Step 3: Cross multiply
    15,306.13x = 21,125.37 × 9,991.72
  4. Step 4: Simplify right side
    15,306.13x = 211,078,781.94
  5. Step 5: Solve for x
    x = 211,078,781.94/15,306.13
  6. Step 6: Final answer
    x = 13,790.47

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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.