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Finding the Fourth Proportional to 39,166.72, 58,728 and 12,864.40

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Solution

The fourth proportional to 39,166.72, 58,728 and 12,864.40 is: 19,289.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,166.72 : 58,728 = 12,864.40 : x
  2. Step 2: Convert to fraction form
    39,166.72/58,728 = 12,864.40/x
  3. Step 3: Cross multiply
    39,166.72x = 58,728 × 12,864.40
  4. Step 4: Simplify right side
    39,166.72x = 755,500,483.20
  5. Step 5: Solve for x
    x = 755,500,483.20/39,166.72
  6. Step 6: Final answer
    x = 19,289.35

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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.