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Finding the Fourth Proportional to 617.70, 866.40 and 617.70

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Solution

The fourth proportional to 617.70, 866.40 and 617.70 is: 866.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.70 : 866.40 = 617.70 : x
  2. Step 2: Convert to fraction form
    617.70/866.40 = 617.70/x
  3. Step 3: Cross multiply
    617.70x = 866.40 × 617.70
  4. Step 4: Simplify right side
    617.70x = 535,175.28
  5. Step 5: Solve for x
    x = 535,175.28/617.70
  6. Step 6: Final answer
    x = 866.40

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.