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Finding the Fourth Proportional to 777.72, 1,166.80 and 412.22

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Solution

The fourth proportional to 777.72, 1,166.80 and 412.22 is: 618.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.72 : 1,166.80 = 412.22 : x
  2. Step 2: Convert to fraction form
    777.72/1,166.80 = 412.22/x
  3. Step 3: Cross multiply
    777.72x = 1,166.80 × 412.22
  4. Step 4: Simplify right side
    777.72x = 480,978.30
  5. Step 5: Solve for x
    x = 480,978.30/777.72
  6. Step 6: Final answer
    x = 618.45

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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.