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Finding the Fourth Proportional to 39,720.40, 54,810.72 and 22,721.20

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Solution

The fourth proportional to 39,720.40, 54,810.72 and 22,721.20 is: 31,353.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.40 : 54,810.72 = 22,721.20 : x
  2. Step 2: Convert to fraction form
    39,720.40/54,810.72 = 22,721.20/x
  3. Step 3: Cross multiply
    39,720.40x = 54,810.72 × 22,721.20
  4. Step 4: Simplify right side
    39,720.40x = 1,245,365,331.26
  5. Step 5: Solve for x
    x = 1,245,365,331.26/39,720.40
  6. Step 6: Final answer
    x = 31,353.29

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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.