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Finding the Fourth Proportional to 669.58, 921.98 and 630.61

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Solution

The fourth proportional to 669.58, 921.98 and 630.61 is: 868.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.58 : 921.98 = 630.61 : x
  2. Step 2: Convert to fraction form
    669.58/921.98 = 630.61/x
  3. Step 3: Cross multiply
    669.58x = 921.98 × 630.61
  4. Step 4: Simplify right side
    669.58x = 581,409.08
  5. Step 5: Solve for x
    x = 581,409.08/669.58
  6. Step 6: Final answer
    x = 868.32

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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.