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Finding the Fourth Proportional to 955.72, 1,318.69 and 624.63

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Solution

The fourth proportional to 955.72, 1,318.69 and 624.63 is: 861.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.72 : 1,318.69 = 624.63 : x
  2. Step 2: Convert to fraction form
    955.72/1,318.69 = 624.63/x
  3. Step 3: Cross multiply
    955.72x = 1,318.69 × 624.63
  4. Step 4: Simplify right side
    955.72x = 823,693.33
  5. Step 5: Solve for x
    x = 823,693.33/955.72
  6. Step 6: Final answer
    x = 861.86

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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.