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Finding the Fourth Proportional to 767.43, 1,059.78 and 505.59

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Solution

The fourth proportional to 767.43, 1,059.78 and 505.59 is: 698.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.43 : 1,059.78 = 505.59 : x
  2. Step 2: Convert to fraction form
    767.43/1,059.78 = 505.59/x
  3. Step 3: Cross multiply
    767.43x = 1,059.78 × 505.59
  4. Step 4: Simplify right side
    767.43x = 535,814.17
  5. Step 5: Solve for x
    x = 535,814.17/767.43
  6. Step 6: Final answer
    x = 698.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.