Home / 15,387.84-21,221.28-10,080.72

Finding the Fourth Proportional to 15,387.84, 21,221.28 and 10,080.72

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Solution

The fourth proportional to 15,387.84, 21,221.28 and 10,080.72 is: 13,902.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,387.84 : 21,221.28 = 10,080.72 : x
  2. Step 2: Convert to fraction form
    15,387.84/21,221.28 = 10,080.72/x
  3. Step 3: Cross multiply
    15,387.84x = 21,221.28 × 10,080.72
  4. Step 4: Simplify right side
    15,387.84x = 213,925,781.72
  5. Step 5: Solve for x
    x = 213,925,781.72/15,387.84
  6. Step 6: Final answer
    x = 13,902.26

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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.