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Finding the Fourth Proportional to 648.12, 965.74 and 616.74

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Solution

The fourth proportional to 648.12, 965.74 and 616.74 is: 918.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.12 : 965.74 = 616.74 : x
  2. Step 2: Convert to fraction form
    648.12/965.74 = 616.74/x
  3. Step 3: Cross multiply
    648.12x = 965.74 × 616.74
  4. Step 4: Simplify right side
    648.12x = 595,610.49
  5. Step 5: Solve for x
    x = 595,610.49/648.12
  6. Step 6: Final answer
    x = 918.98

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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.