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Finding the Fourth Proportional to 662.78, 912.66 and 626.06

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Solution

The fourth proportional to 662.78, 912.66 and 626.06 is: 862.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.78 : 912.66 = 626.06 : x
  2. Step 2: Convert to fraction form
    662.78/912.66 = 626.06/x
  3. Step 3: Cross multiply
    662.78x = 912.66 × 626.06
  4. Step 4: Simplify right side
    662.78x = 571,379.92
  5. Step 5: Solve for x
    x = 571,379.92/662.78
  6. Step 6: Final answer
    x = 862.10

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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.