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Finding the Fourth Proportional to 660.48, 912.66 and 628.45

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Solution

The fourth proportional to 660.48, 912.66 and 628.45 is: 868.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.48 : 912.66 = 628.45 : x
  2. Step 2: Convert to fraction form
    660.48/912.66 = 628.45/x
  3. Step 3: Cross multiply
    660.48x = 912.66 × 628.45
  4. Step 4: Simplify right side
    660.48x = 573,561.18
  5. Step 5: Solve for x
    x = 573,561.18/660.48
  6. Step 6: Final answer
    x = 868.41

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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.