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Finding the Fourth Proportional to 66,722.61, 92,074.50 and 39,879.93

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Solution

The fourth proportional to 66,722.61, 92,074.50 and 39,879.93 is: 55,032.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,722.61 : 92,074.50 = 39,879.93 : x
  2. Step 2: Convert to fraction form
    66,722.61/92,074.50 = 39,879.93/x
  3. Step 3: Cross multiply
    66,722.61x = 92,074.50 × 39,879.93
  4. Step 4: Simplify right side
    66,722.61x = 3,671,924,614.79
  5. Step 5: Solve for x
    x = 3,671,924,614.79/66,722.61
  6. Step 6: Final answer
    x = 55,032.69

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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.