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Finding the Fourth Proportional to 918.82, 1,377.30 and 456.93

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Solution

The fourth proportional to 918.82, 1,377.30 and 456.93 is: 684.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.82 : 1,377.30 = 456.93 : x
  2. Step 2: Convert to fraction form
    918.82/1,377.30 = 456.93/x
  3. Step 3: Cross multiply
    918.82x = 1,377.30 × 456.93
  4. Step 4: Simplify right side
    918.82x = 629,329.69
  5. Step 5: Solve for x
    x = 629,329.69/918.82
  6. Step 6: Final answer
    x = 684.93

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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.