Home / 39,643.90-54,708.55-21,739.20

Finding the Fourth Proportional to 39,643.90, 54,708.55 and 21,739.20

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Solution

The fourth proportional to 39,643.90, 54,708.55 and 21,739.20 is: 30,000.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,643.90 : 54,708.55 = 21,739.20 : x
  2. Step 2: Convert to fraction form
    39,643.90/54,708.55 = 21,739.20/x
  3. Step 3: Cross multiply
    39,643.90x = 54,708.55 × 21,739.20
  4. Step 4: Simplify right side
    39,643.90x = 1,189,320,110.16
  5. Step 5: Solve for x
    x = 1,189,320,110.16/39,643.90
  6. Step 6: Final answer
    x = 30,000.08

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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.