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Finding the Fourth Proportional to 777.62, 1,166.86 and 517.74

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Solution

The fourth proportional to 777.62, 1,166.86 and 517.74 is: 776.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.62 : 1,166.86 = 517.74 : x
  2. Step 2: Convert to fraction form
    777.62/1,166.86 = 517.74/x
  3. Step 3: Cross multiply
    777.62x = 1,166.86 × 517.74
  4. Step 4: Simplify right side
    777.62x = 604,126.37
  5. Step 5: Solve for x
    x = 604,126.37/777.62
  6. Step 6: Final answer
    x = 776.89

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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.