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Finding the Fourth Proportional to 662.63, 988.90 and 618.62

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Solution

The fourth proportional to 662.63, 988.90 and 618.62 is: 923.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.63 : 988.90 = 618.62 : x
  2. Step 2: Convert to fraction form
    662.63/988.90 = 618.62/x
  3. Step 3: Cross multiply
    662.63x = 988.90 × 618.62
  4. Step 4: Simplify right side
    662.63x = 611,746.83
  5. Step 5: Solve for x
    x = 611,746.83/662.63
  6. Step 6: Final answer
    x = 923.22

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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.