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Finding the Fourth Proportional to 38,640.67, 53,326.11 and 21,643.90

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Solution

The fourth proportional to 38,640.67, 53,326.11 and 21,643.90 is: 29,869.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,640.67 : 53,326.11 = 21,643.90 : x
  2. Step 2: Convert to fraction form
    38,640.67/53,326.11 = 21,643.90/x
  3. Step 3: Cross multiply
    38,640.67x = 53,326.11 × 21,643.90
  4. Step 4: Simplify right side
    38,640.67x = 1,154,184,992.23
  5. Step 5: Solve for x
    x = 1,154,184,992.23/38,640.67
  6. Step 6: Final answer
    x = 29,869.69

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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.