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Finding the Fourth Proportional to 918.21, 1,267.37 and 568.70

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Solution

The fourth proportional to 918.21, 1,267.37 and 568.70 is: 784.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.21 : 1,267.37 = 568.70 : x
  2. Step 2: Convert to fraction form
    918.21/1,267.37 = 568.70/x
  3. Step 3: Cross multiply
    918.21x = 1,267.37 × 568.70
  4. Step 4: Simplify right side
    918.21x = 720,744.14
  5. Step 5: Solve for x
    x = 720,744.14/918.21
  6. Step 6: Final answer
    x = 784.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.