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Finding the Fourth Proportional to 988.70, 1,472.58 and 936.65

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Solution

The fourth proportional to 988.70, 1,472.58 and 936.65 is: 1,395.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.70 : 1,472.58 = 936.65 : x
  2. Step 2: Convert to fraction form
    988.70/1,472.58 = 936.65/x
  3. Step 3: Cross multiply
    988.70x = 1,472.58 × 936.65
  4. Step 4: Simplify right side
    988.70x = 1,379,284.69
  5. Step 5: Solve for x
    x = 1,379,284.69/988.70
  6. Step 6: Final answer
    x = 1,395.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.