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Finding the Fourth Proportional to 705.79, 1,056.61 and 521.97

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Solution

The fourth proportional to 705.79, 1,056.61 and 521.97 is: 781.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.79 : 1,056.61 = 521.97 : x
  2. Step 2: Convert to fraction form
    705.79/1,056.61 = 521.97/x
  3. Step 3: Cross multiply
    705.79x = 1,056.61 × 521.97
  4. Step 4: Simplify right side
    705.79x = 551,518.72
  5. Step 5: Solve for x
    x = 551,518.72/705.79
  6. Step 6: Final answer
    x = 781.42

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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.