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Finding the Fourth Proportional to 26,123.60, 39,120.60 and 20,939.60

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Solution

The fourth proportional to 26,123.60, 39,120.60 and 20,939.60 is: 31,357.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,123.60 : 39,120.60 = 20,939.60 : x
  2. Step 2: Convert to fraction form
    26,123.60/39,120.60 = 20,939.60/x
  3. Step 3: Cross multiply
    26,123.60x = 39,120.60 × 20,939.60
  4. Step 4: Simplify right side
    26,123.60x = 819,169,715.76
  5. Step 5: Solve for x
    x = 819,169,715.76/26,123.60
  6. Step 6: Final answer
    x = 31,357.46

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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.