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Finding the Fourth Proportional to 918.67, 1,376.68 and 709.71

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Solution

The fourth proportional to 918.67, 1,376.68 and 709.71 is: 1,063.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.67 : 1,376.68 = 709.71 : x
  2. Step 2: Convert to fraction form
    918.67/1,376.68 = 709.71/x
  3. Step 3: Cross multiply
    918.67x = 1,376.68 × 709.71
  4. Step 4: Simplify right side
    918.67x = 977,043.56
  5. Step 5: Solve for x
    x = 977,043.56/918.67
  6. Step 6: Final answer
    x = 1,063.54

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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.