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Finding the Fourth Proportional to 20,648.39, 30,878.01 and 15,387.06

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Solution

The fourth proportional to 20,648.39, 30,878.01 and 15,387.06 is: 23,010.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,648.39 : 30,878.01 = 15,387.06 : x
  2. Step 2: Convert to fraction form
    20,648.39/30,878.01 = 15,387.06/x
  3. Step 3: Cross multiply
    20,648.39x = 30,878.01 × 15,387.06
  4. Step 4: Simplify right side
    20,648.39x = 475,121,792.55
  5. Step 5: Solve for x
    x = 475,121,792.55/20,648.39
  6. Step 6: Final answer
    x = 23,010.11

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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.