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Finding the Fourth Proportional to 701.73, 1,056.80 and 639.45

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Solution

The fourth proportional to 701.73, 1,056.80 and 639.45 is: 963.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    701.73 : 1,056.80 = 639.45 : x
  2. Step 2: Convert to fraction form
    701.73/1,056.80 = 639.45/x
  3. Step 3: Cross multiply
    701.73x = 1,056.80 × 639.45
  4. Step 4: Simplify right side
    701.73x = 675,767.56
  5. Step 5: Solve for x
    x = 675,767.56/701.73
  6. Step 6: Final answer
    x = 963.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.