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Finding the Fourth Proportional to 102,990.79, 142,102.78 and 62,704.09

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Solution

The fourth proportional to 102,990.79, 142,102.78 and 62,704.09 is: 86,516.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,990.79 : 142,102.78 = 62,704.09 : x
  2. Step 2: Convert to fraction form
    102,990.79/142,102.78 = 62,704.09/x
  3. Step 3: Cross multiply
    102,990.79x = 142,102.78 × 62,704.09
  4. Step 4: Simplify right side
    102,990.79x = 8,910,425,506.37
  5. Step 5: Solve for x
    x = 8,910,425,506.37/102,990.79
  6. Step 6: Final answer
    x = 86,516.72

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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.