Home / 20,815.60-31,223.40-12,521.20

Finding the Fourth Proportional to 20,815.60, 31,223.40 and 12,521.20

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Solution

The fourth proportional to 20,815.60, 31,223.40 and 12,521.20 is: 18,781.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.60 : 31,223.40 = 12,521.20 : x
  2. Step 2: Convert to fraction form
    20,815.60/31,223.40 = 12,521.20/x
  3. Step 3: Cross multiply
    20,815.60x = 31,223.40 × 12,521.20
  4. Step 4: Simplify right side
    20,815.60x = 390,954,436.08
  5. Step 5: Solve for x
    x = 390,954,436.08/20,815.60
  6. Step 6: Final answer
    x = 18,781.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.