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Finding the Fourth Proportional to 38,643.38, 53,323.49 and 21,645.30

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Solution

The fourth proportional to 38,643.38, 53,323.49 and 21,645.30 is: 29,868.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,643.38 : 53,323.49 = 21,645.30 : x
  2. Step 2: Convert to fraction form
    38,643.38/53,323.49 = 21,645.30/x
  3. Step 3: Cross multiply
    38,643.38x = 53,323.49 × 21,645.30
  4. Step 4: Simplify right side
    38,643.38x = 1,154,202,938.10
  5. Step 5: Solve for x
    x = 1,154,202,938.10/38,643.38
  6. Step 6: Final answer
    x = 29,868.06

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Similar ratio
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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.