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Finding the Fourth Proportional to 626.81, 865.15 and 402.72

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Solution

The fourth proportional to 626.81, 865.15 and 402.72 is: 555.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.81 : 865.15 = 402.72 : x
  2. Step 2: Convert to fraction form
    626.81/865.15 = 402.72/x
  3. Step 3: Cross multiply
    626.81x = 865.15 × 402.72
  4. Step 4: Simplify right side
    626.81x = 348,413.82
  5. Step 5: Solve for x
    x = 348,413.82/626.81
  6. Step 6: Final answer
    x = 555.86

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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.