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Finding the Fourth Proportional to 1,000.14, 1,379.70 and 668.65

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Solution

The fourth proportional to 1,000.14, 1,379.70 and 668.65 is: 922.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.14 : 1,379.70 = 668.65 : x
  2. Step 2: Convert to fraction form
    1,000.14/1,379.70 = 668.65/x
  3. Step 3: Cross multiply
    1,000.14x = 1,379.70 × 668.65
  4. Step 4: Simplify right side
    1,000.14x = 922,526.16
  5. Step 5: Solve for x
    x = 922,526.16/1,000.14
  6. Step 6: Final answer
    x = 922.40

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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.