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Finding the Fourth Proportional to 707.94, 1,061.91 and 490.86

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Solution

The fourth proportional to 707.94, 1,061.91 and 490.86 is: 736.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.94 : 1,061.91 = 490.86 : x
  2. Step 2: Convert to fraction form
    707.94/1,061.91 = 490.86/x
  3. Step 3: Cross multiply
    707.94x = 1,061.91 × 490.86
  4. Step 4: Simplify right side
    707.94x = 521,249.14
  5. Step 5: Solve for x
    x = 521,249.14/707.94
  6. Step 6: Final answer
    x = 736.29

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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.