Home / 21,987.72-30,344.04-15,621.12

Finding the Fourth Proportional to 21,987.72, 30,344.04 and 15,621.12

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Solution

The fourth proportional to 21,987.72, 30,344.04 and 15,621.12 is: 21,557.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.72 : 30,344.04 = 15,621.12 : x
  2. Step 2: Convert to fraction form
    21,987.72/30,344.04 = 15,621.12/x
  3. Step 3: Cross multiply
    21,987.72x = 30,344.04 × 15,621.12
  4. Step 4: Simplify right side
    21,987.72x = 474,007,890.12
  5. Step 5: Solve for x
    x = 474,007,890.12/21,987.72
  6. Step 6: Final answer
    x = 21,557.85

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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.