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Finding the Fourth Proportional to 660.80, 912.66 and 484.56

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Solution

The fourth proportional to 660.80, 912.66 and 484.56 is: 669.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.80 : 912.66 = 484.56 : x
  2. Step 2: Convert to fraction form
    660.80/912.66 = 484.56/x
  3. Step 3: Cross multiply
    660.80x = 912.66 × 484.56
  4. Step 4: Simplify right side
    660.80x = 442,238.53
  5. Step 5: Solve for x
    x = 442,238.53/660.80
  6. Step 6: Final answer
    x = 669.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.