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Finding the Fourth Proportional to 646.92, 971.06 and 403.61

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Solution

The fourth proportional to 646.92, 971.06 and 403.61 is: 605.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.92 : 971.06 = 403.61 : x
  2. Step 2: Convert to fraction form
    646.92/971.06 = 403.61/x
  3. Step 3: Cross multiply
    646.92x = 971.06 × 403.61
  4. Step 4: Simplify right side
    646.92x = 391,927.51
  5. Step 5: Solve for x
    x = 391,927.51/646.92
  6. Step 6: Final answer
    x = 605.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.