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Finding the Fourth Proportional to 39,898.29, 55,058.95 and 21,749.20

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Solution

The fourth proportional to 39,898.29, 55,058.95 and 21,749.20 is: 30,013.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,898.29 : 55,058.95 = 21,749.20 : x
  2. Step 2: Convert to fraction form
    39,898.29/55,058.95 = 21,749.20/x
  3. Step 3: Cross multiply
    39,898.29x = 55,058.95 × 21,749.20
  4. Step 4: Simplify right side
    39,898.29x = 1,197,488,115.34
  5. Step 5: Solve for x
    x = 1,197,488,115.34/39,898.29
  6. Step 6: Final answer
    x = 30,013.52

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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.