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Finding the Fourth Proportional to 74,872.88, 103,320.08 and 40,874.64

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Solution

The fourth proportional to 74,872.88, 103,320.08 and 40,874.64 is: 56,404.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,872.88 : 103,320.08 = 40,874.64 : x
  2. Step 2: Convert to fraction form
    74,872.88/103,320.08 = 40,874.64/x
  3. Step 3: Cross multiply
    74,872.88x = 103,320.08 × 40,874.64
  4. Step 4: Simplify right side
    74,872.88x = 4,223,171,074.77
  5. Step 5: Solve for x
    x = 4,223,171,074.77/74,872.88
  6. Step 6: Final answer
    x = 56,404.55

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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.