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Finding the Fourth Proportional to 5,739.48, 7,920.38 and 3,221.40

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Solution

The fourth proportional to 5,739.48, 7,920.38 and 3,221.40 is: 4,445.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,739.48 : 7,920.38 = 3,221.40 : x
  2. Step 2: Convert to fraction form
    5,739.48/7,920.38 = 3,221.40/x
  3. Step 3: Cross multiply
    5,739.48x = 7,920.38 × 3,221.40
  4. Step 4: Simplify right side
    5,739.48x = 25,514,712.13
  5. Step 5: Solve for x
    x = 25,514,712.13/5,739.48
  6. Step 6: Final answer
    x = 4,445.47

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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.