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Finding the Fourth Proportional to 39,978.90, 55,170.63 and 22,073.76

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Solution

The fourth proportional to 39,978.90, 55,170.63 and 22,073.76 is: 30,461.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.90 : 55,170.63 = 22,073.76 : x
  2. Step 2: Convert to fraction form
    39,978.90/55,170.63 = 22,073.76/x
  3. Step 3: Cross multiply
    39,978.90x = 55,170.63 × 22,073.76
  4. Step 4: Simplify right side
    39,978.90x = 1,217,823,245.67
  5. Step 5: Solve for x
    x = 1,217,823,245.67/39,978.90
  6. Step 6: Final answer
    x = 30,461.65

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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.