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Finding the Fourth Proportional to 661.72, 987.05 and 616.36

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Solution

The fourth proportional to 661.72, 987.05 and 616.36 is: 919.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.72 : 987.05 = 616.36 : x
  2. Step 2: Convert to fraction form
    661.72/987.05 = 616.36/x
  3. Step 3: Cross multiply
    661.72x = 987.05 × 616.36
  4. Step 4: Simplify right side
    661.72x = 608,378.14
  5. Step 5: Solve for x
    x = 608,378.14/661.72
  6. Step 6: Final answer
    x = 919.39

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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.