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Finding the Fourth Proportional to 705.56, 1,056.04 and 639.92

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Solution

The fourth proportional to 705.56, 1,056.04 and 639.92 is: 957.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.56 : 1,056.04 = 639.92 : x
  2. Step 2: Convert to fraction form
    705.56/1,056.04 = 639.92/x
  3. Step 3: Cross multiply
    705.56x = 1,056.04 × 639.92
  4. Step 4: Simplify right side
    705.56x = 675,781.12
  5. Step 5: Solve for x
    x = 675,781.12/705.56
  6. Step 6: Final answer
    x = 957.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.