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Finding the Fourth Proportional to 58,579.88, 87,870.90 and 21,142.76

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Solution

The fourth proportional to 58,579.88, 87,870.90 and 21,142.76 is: 31,714.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    58,579.88 : 87,870.90 = 21,142.76 : x
  2. Step 2: Convert to fraction form
    58,579.88/87,870.90 = 21,142.76/x
  3. Step 3: Cross multiply
    58,579.88x = 87,870.90 × 21,142.76
  4. Step 4: Simplify right side
    58,579.88x = 1,857,832,910.33
  5. Step 5: Solve for x
    x = 1,857,832,910.33/58,579.88
  6. Step 6: Final answer
    x = 31,714.53

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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.