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Finding the Fourth Proportional to 27,999.78, 38,642.46 and 20,913.90

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Solution

The fourth proportional to 27,999.78, 38,642.46 and 20,913.90 is: 28,863.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,999.78 : 38,642.46 = 20,913.90 : x
  2. Step 2: Convert to fraction form
    27,999.78/38,642.46 = 20,913.90/x
  3. Step 3: Cross multiply
    27,999.78x = 38,642.46 × 20,913.90
  4. Step 4: Simplify right side
    27,999.78x = 808,164,544.19
  5. Step 5: Solve for x
    x = 808,164,544.19/27,999.78
  6. Step 6: Final answer
    x = 28,863.25

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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.