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Finding the Fourth Proportional to 918.34, 1,376.47 and 455.65

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Solution

The fourth proportional to 918.34, 1,376.47 and 455.65 is: 682.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.34 : 1,376.47 = 455.65 : x
  2. Step 2: Convert to fraction form
    918.34/1,376.47 = 455.65/x
  3. Step 3: Cross multiply
    918.34x = 1,376.47 × 455.65
  4. Step 4: Simplify right side
    918.34x = 627,188.27
  5. Step 5: Solve for x
    x = 627,188.27/918.34
  6. Step 6: Final answer
    x = 682.96

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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.