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Finding the Fourth Proportional to 38,643.90, 54,145.20 and 38,643.90

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Solution

The fourth proportional to 38,643.90, 54,145.20 and 38,643.90 is: 54,145.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,643.90 : 54,145.20 = 38,643.90 : x
  2. Step 2: Convert to fraction form
    38,643.90/54,145.20 = 38,643.90/x
  3. Step 3: Cross multiply
    38,643.90x = 54,145.20 × 38,643.90
  4. Step 4: Simplify right side
    38,643.90x = 2,092,381,694.28
  5. Step 5: Solve for x
    x = 2,092,381,694.28/38,643.90
  6. Step 6: Final answer
    x = 54,145.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.