Home / 20,812.68-28,721.16-11,381.04

Finding the Fourth Proportional to 20,812.68, 28,721.16 and 11,381.04

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Solution

The fourth proportional to 20,812.68, 28,721.16 and 11,381.04 is: 15,705.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.68 : 28,721.16 = 11,381.04 : x
  2. Step 2: Convert to fraction form
    20,812.68/28,721.16 = 11,381.04/x
  3. Step 3: Cross multiply
    20,812.68x = 28,721.16 × 11,381.04
  4. Step 4: Simplify right side
    20,812.68x = 326,876,670.81
  5. Step 5: Solve for x
    x = 326,876,670.81/20,812.68
  6. Step 6: Final answer
    x = 15,705.65

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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.