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Finding the Fourth Proportional to 647.33, 971.33 and 257.54

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Solution

The fourth proportional to 647.33, 971.33 and 257.54 is: 386.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.33 : 971.33 = 257.54 : x
  2. Step 2: Convert to fraction form
    647.33/971.33 = 257.54/x
  3. Step 3: Cross multiply
    647.33x = 971.33 × 257.54
  4. Step 4: Simplify right side
    647.33x = 250,150.18
  5. Step 5: Solve for x
    x = 250,150.18/647.33
  6. Step 6: Final answer
    x = 386.44

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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.