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Finding the Fourth Proportional to 630.66, 939.98 and 618.51

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Solution

The fourth proportional to 630.66, 939.98 and 618.51 is: 921.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.66 : 939.98 = 618.51 : x
  2. Step 2: Convert to fraction form
    630.66/939.98 = 618.51/x
  3. Step 3: Cross multiply
    630.66x = 939.98 × 618.51
  4. Step 4: Simplify right side
    630.66x = 581,383.94
  5. Step 5: Solve for x
    x = 581,383.94/630.66
  6. Step 6: Final answer
    x = 921.87

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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.