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Finding the Fourth Proportional to 775.56, 1,161.51 and 612.15

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Solution

The fourth proportional to 775.56, 1,161.51 and 612.15 is: 916.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.56 : 1,161.51 = 612.15 : x
  2. Step 2: Convert to fraction form
    775.56/1,161.51 = 612.15/x
  3. Step 3: Cross multiply
    775.56x = 1,161.51 × 612.15
  4. Step 4: Simplify right side
    775.56x = 711,018.35
  5. Step 5: Solve for x
    x = 711,018.35/775.56
  6. Step 6: Final answer
    x = 916.78

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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.