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Finding the Fourth Proportional to 775.10, 1,162.74 and 612.56

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Solution

The fourth proportional to 775.10, 1,162.74 and 612.56 is: 918.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.10 : 1,162.74 = 612.56 : x
  2. Step 2: Convert to fraction form
    775.10/1,162.74 = 612.56/x
  3. Step 3: Cross multiply
    775.10x = 1,162.74 × 612.56
  4. Step 4: Simplify right side
    775.10x = 712,248.01
  5. Step 5: Solve for x
    x = 712,248.01/775.10
  6. Step 6: Final answer
    x = 918.91

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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.