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Finding the Fourth Proportional to 39,779.88, 54,895.74 and 21,874.74

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Solution

The fourth proportional to 39,779.88, 54,895.74 and 21,874.74 is: 30,186.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,779.88 : 54,895.74 = 21,874.74 : x
  2. Step 2: Convert to fraction form
    39,779.88/54,895.74 = 21,874.74/x
  3. Step 3: Cross multiply
    39,779.88x = 54,895.74 × 21,874.74
  4. Step 4: Simplify right side
    39,779.88x = 1,200,830,039.61
  5. Step 5: Solve for x
    x = 1,200,830,039.61/39,779.88
  6. Step 6: Final answer
    x = 30,186.87

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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.