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Finding the Fourth Proportional to 707.85, 1,061.72 and 414.43

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Solution

The fourth proportional to 707.85, 1,061.72 and 414.43 is: 621.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.85 : 1,061.72 = 414.43 : x
  2. Step 2: Convert to fraction form
    707.85/1,061.72 = 414.43/x
  3. Step 3: Cross multiply
    707.85x = 1,061.72 × 414.43
  4. Step 4: Simplify right side
    707.85x = 440,005.45
  5. Step 5: Solve for x
    x = 440,005.45/707.85
  6. Step 6: Final answer
    x = 621.61

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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.