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Finding the Fourth Proportional to 660.87, 986.46 and 612

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Solution

The fourth proportional to 660.87, 986.46 and 612 is: 913.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.87 : 986.46 = 612 : x
  2. Step 2: Convert to fraction form
    660.87/986.46 = 612/x
  3. Step 3: Cross multiply
    660.87x = 986.46 × 612
  4. Step 4: Simplify right side
    660.87x = 603,713.52
  5. Step 5: Solve for x
    x = 603,713.52/660.87
  6. Step 6: Final answer
    x = 913.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.