Home / 20,987.32-28,900.10-20,521.72

Finding the Fourth Proportional to 20,987.32, 28,900.10 and 20,521.72

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Solution

The fourth proportional to 20,987.32, 28,900.10 and 20,521.72 is: 28,258.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.32 : 28,900.10 = 20,521.72 : x
  2. Step 2: Convert to fraction form
    20,987.32/28,900.10 = 20,521.72/x
  3. Step 3: Cross multiply
    20,987.32x = 28,900.10 × 20,521.72
  4. Step 4: Simplify right side
    20,987.32x = 593,079,760.17
  5. Step 5: Solve for x
    x = 593,079,760.17/20,987.32
  6. Step 6: Final answer
    x = 28,258.96

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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.