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Finding the Fourth Proportional to 39,170.72, 58,734 and 12,868.40

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Solution

The fourth proportional to 39,170.72, 58,734 and 12,868.40 is: 19,295.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,170.72 : 58,734 = 12,868.40 : x
  2. Step 2: Convert to fraction form
    39,170.72/58,734 = 12,868.40/x
  3. Step 3: Cross multiply
    39,170.72x = 58,734 × 12,868.40
  4. Step 4: Simplify right side
    39,170.72x = 755,812,605.60
  5. Step 5: Solve for x
    x = 755,812,605.60/39,170.72
  6. Step 6: Final answer
    x = 19,295.35

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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.