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Finding the Fourth Proportional to 26,978.72, 37,243.85 and 20,915.55

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Solution

The fourth proportional to 26,978.72, 37,243.85 and 20,915.55 is: 28,873.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,978.72 : 37,243.85 = 20,915.55 : x
  2. Step 2: Convert to fraction form
    26,978.72/37,243.85 = 20,915.55/x
  3. Step 3: Cross multiply
    26,978.72x = 37,243.85 × 20,915.55
  4. Step 4: Simplify right side
    26,978.72x = 778,975,502.29
  5. Step 5: Solve for x
    x = 778,975,502.29/26,978.72
  6. Step 6: Final answer
    x = 28,873.71

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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.