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Finding the Fourth Proportional to 918.46, 1,378.27 and 370.65

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Solution

The fourth proportional to 918.46, 1,378.27 and 370.65 is: 556.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.46 : 1,378.27 = 370.65 : x
  2. Step 2: Convert to fraction form
    918.46/1,378.27 = 370.65/x
  3. Step 3: Cross multiply
    918.46x = 1,378.27 × 370.65
  4. Step 4: Simplify right side
    918.46x = 510,855.45
  5. Step 5: Solve for x
    x = 510,855.45/918.46
  6. Step 6: Final answer
    x = 556.21

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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.