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Finding the Fourth Proportional to 660.06, 910.71 and 397.89

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Solution

The fourth proportional to 660.06, 910.71 and 397.89 is: 548.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.06 : 910.71 = 397.89 : x
  2. Step 2: Convert to fraction form
    660.06/910.71 = 397.89/x
  3. Step 3: Cross multiply
    660.06x = 910.71 × 397.89
  4. Step 4: Simplify right side
    660.06x = 362,362.40
  5. Step 5: Solve for x
    x = 362,362.40/660.06
  6. Step 6: Final answer
    x = 548.98

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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.