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Finding the Fourth Proportional to 52,872.90, 79,290.90 and 21,274.77

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Solution

The fourth proportional to 52,872.90, 79,290.90 and 21,274.77 is: 31,904.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,872.90 : 79,290.90 = 21,274.77 : x
  2. Step 2: Convert to fraction form
    52,872.90/79,290.90 = 21,274.77/x
  3. Step 3: Cross multiply
    52,872.90x = 79,290.90 × 21,274.77
  4. Step 4: Simplify right side
    52,872.90x = 1,686,895,997.82
  5. Step 5: Solve for x
    x = 1,686,895,997.82/52,872.90
  6. Step 6: Final answer
    x = 31,904.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.