Home / 39,121.92-53,988.28-21,216.92

Finding the Fourth Proportional to 39,121.92, 53,988.28 and 21,216.92

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Solution

The fourth proportional to 39,121.92, 53,988.28 and 21,216.92 is: 29,279.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,121.92 : 53,988.28 = 21,216.92 : x
  2. Step 2: Convert to fraction form
    39,121.92/53,988.28 = 21,216.92/x
  3. Step 3: Cross multiply
    39,121.92x = 53,988.28 × 21,216.92
  4. Step 4: Simplify right side
    39,121.92x = 1,145,464,911.61
  5. Step 5: Solve for x
    x = 1,145,464,911.61/39,121.92
  6. Step 6: Final answer
    x = 29,279.36

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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.