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Finding the Fourth Proportional to 1,678.29, 2,516.10 and 638.25

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Solution

The fourth proportional to 1,678.29, 2,516.10 and 638.25 is: 956.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.29 : 2,516.10 = 638.25 : x
  2. Step 2: Convert to fraction form
    1,678.29/2,516.10 = 638.25/x
  3. Step 3: Cross multiply
    1,678.29x = 2,516.10 × 638.25
  4. Step 4: Simplify right side
    1,678.29x = 1,605,900.83
  5. Step 5: Solve for x
    x = 1,605,900.83/1,678.29
  6. Step 6: Final answer
    x = 956.87

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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.