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Finding the Fourth Proportional to 777.62, 1,165.79 and 558.09

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Solution

The fourth proportional to 777.62, 1,165.79 and 558.09 is: 836.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.62 : 1,165.79 = 558.09 : x
  2. Step 2: Convert to fraction form
    777.62/1,165.79 = 558.09/x
  3. Step 3: Cross multiply
    777.62x = 1,165.79 × 558.09
  4. Step 4: Simplify right side
    777.62x = 650,617.14
  5. Step 5: Solve for x
    x = 650,617.14/777.62
  6. Step 6: Final answer
    x = 836.67

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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.