Home / 20,381.06-28,113.92-12,815.40

Finding the Fourth Proportional to 20,381.06, 28,113.92 and 12,815.40

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Solution

The fourth proportional to 20,381.06, 28,113.92 and 12,815.40 is: 17,677.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.06 : 28,113.92 = 12,815.40 : x
  2. Step 2: Convert to fraction form
    20,381.06/28,113.92 = 12,815.40/x
  3. Step 3: Cross multiply
    20,381.06x = 28,113.92 × 12,815.40
  4. Step 4: Simplify right side
    20,381.06x = 360,291,066.29
  5. Step 5: Solve for x
    x = 360,291,066.29/20,381.06
  6. Step 6: Final answer
    x = 17,677.74

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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.