Home / 20,999.30-28,954.98-15,685.16

Finding the Fourth Proportional to 20,999.30, 28,954.98 and 15,685.16

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Solution

The fourth proportional to 20,999.30, 28,954.98 and 15,685.16 is: 21,627.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.30 : 28,954.98 = 15,685.16 : x
  2. Step 2: Convert to fraction form
    20,999.30/28,954.98 = 15,685.16/x
  3. Step 3: Cross multiply
    20,999.30x = 28,954.98 × 15,685.16
  4. Step 4: Simplify right side
    20,999.30x = 454,163,494.10
  5. Step 5: Solve for x
    x = 454,163,494.10/20,999.30
  6. Step 6: Final answer
    x = 21,627.55

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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.