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Finding the Fourth Proportional to 918.74, 1,378.54 and 571.96

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Solution

The fourth proportional to 918.74, 1,378.54 and 571.96 is: 858.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.74 : 1,378.54 = 571.96 : x
  2. Step 2: Convert to fraction form
    918.74/1,378.54 = 571.96/x
  3. Step 3: Cross multiply
    918.74x = 1,378.54 × 571.96
  4. Step 4: Simplify right side
    918.74x = 788,469.74
  5. Step 5: Solve for x
    x = 788,469.74/918.74
  6. Step 6: Final answer
    x = 858.21

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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.