Home / 20,768.49-28,691.78-13,615.40

Finding the Fourth Proportional to 20,768.49, 28,691.78 and 13,615.40

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Solution

The fourth proportional to 20,768.49, 28,691.78 and 13,615.40 is: 18,809.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,768.49 : 28,691.78 = 13,615.40 : x
  2. Step 2: Convert to fraction form
    20,768.49/28,691.78 = 13,615.40/x
  3. Step 3: Cross multiply
    20,768.49x = 28,691.78 × 13,615.40
  4. Step 4: Simplify right side
    20,768.49x = 390,650,061.41
  5. Step 5: Solve for x
    x = 390,650,061.41/20,768.49
  6. Step 6: Final answer
    x = 18,809.75

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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.