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Finding the Fourth Proportional to 939.65, 1,410.35 and 679.91

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Solution

The fourth proportional to 939.65, 1,410.35 and 679.91 is: 1,020.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.65 : 1,410.35 = 679.91 : x
  2. Step 2: Convert to fraction form
    939.65/1,410.35 = 679.91/x
  3. Step 3: Cross multiply
    939.65x = 1,410.35 × 679.91
  4. Step 4: Simplify right side
    939.65x = 958,900.62
  5. Step 5: Solve for x
    x = 958,900.62/939.65
  6. Step 6: Final answer
    x = 1,020.49

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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.