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Finding the Fourth Proportional to 1,348.65, 1,861.38 and 789.14

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Solution

The fourth proportional to 1,348.65, 1,861.38 and 789.14 is: 1,089.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,348.65 : 1,861.38 = 789.14 : x
  2. Step 2: Convert to fraction form
    1,348.65/1,861.38 = 789.14/x
  3. Step 3: Cross multiply
    1,348.65x = 1,861.38 × 789.14
  4. Step 4: Simplify right side
    1,348.65x = 1,468,894.07
  5. Step 5: Solve for x
    x = 1,468,894.07/1,348.65
  6. Step 6: Final answer
    x = 1,089.16

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Double scale
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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.