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Finding the Fourth Proportional to 661.77, 917.41 and 626.65

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Solution

The fourth proportional to 661.77, 917.41 and 626.65 is: 868.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.77 : 917.41 = 626.65 : x
  2. Step 2: Convert to fraction form
    661.77/917.41 = 626.65/x
  3. Step 3: Cross multiply
    661.77x = 917.41 × 626.65
  4. Step 4: Simplify right side
    661.77x = 574,894.98
  5. Step 5: Solve for x
    x = 574,894.98/661.77
  6. Step 6: Final answer
    x = 868.72

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.