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Finding the Fourth Proportional to 654.81, 976.49 and 640.77

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Solution

The fourth proportional to 654.81, 976.49 and 640.77 is: 955.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.81 : 976.49 = 640.77 : x
  2. Step 2: Convert to fraction form
    654.81/976.49 = 640.77/x
  3. Step 3: Cross multiply
    654.81x = 976.49 × 640.77
  4. Step 4: Simplify right side
    654.81x = 625,702.29
  5. Step 5: Solve for x
    x = 625,702.29/654.81
  6. Step 6: Final answer
    x = 955.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.