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Finding the Fourth Proportional to 28,607.78, 39,478.02 and 17,286.68

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Solution

The fourth proportional to 28,607.78, 39,478.02 and 17,286.68 is: 23,855.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,607.78 : 39,478.02 = 17,286.68 : x
  2. Step 2: Convert to fraction form
    28,607.78/39,478.02 = 17,286.68/x
  3. Step 3: Cross multiply
    28,607.78x = 39,478.02 × 17,286.68
  4. Step 4: Simplify right side
    28,607.78x = 682,443,898.77
  5. Step 5: Solve for x
    x = 682,443,898.77/28,607.78
  6. Step 6: Final answer
    x = 23,855.19

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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.