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Finding the Fourth Proportional to 660.15, 908.21 and 641.93

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Solution

The fourth proportional to 660.15, 908.21 and 641.93 is: 883.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.15 : 908.21 = 641.93 : x
  2. Step 2: Convert to fraction form
    660.15/908.21 = 641.93/x
  3. Step 3: Cross multiply
    660.15x = 908.21 × 641.93
  4. Step 4: Simplify right side
    660.15x = 583,004.31
  5. Step 5: Solve for x
    x = 583,004.31/660.15
  6. Step 6: Final answer
    x = 883.14

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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.