Home / 20,688.97-28,546.44-13,126.40

Finding the Fourth Proportional to 20,688.97, 28,546.44 and 13,126.40

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Solution

The fourth proportional to 20,688.97, 28,546.44 and 13,126.40 is: 18,111.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.97 : 28,546.44 = 13,126.40 : x
  2. Step 2: Convert to fraction form
    20,688.97/28,546.44 = 13,126.40/x
  3. Step 3: Cross multiply
    20,688.97x = 28,546.44 × 13,126.40
  4. Step 4: Simplify right side
    20,688.97x = 374,712,061.38
  5. Step 5: Solve for x
    x = 374,712,061.38/20,688.97
  6. Step 6: Final answer
    x = 18,111.68

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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.