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Finding the Fourth Proportional to 495.84, 685.11 and 478.32

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Solution

The fourth proportional to 495.84, 685.11 and 478.32 is: 660.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.84 : 685.11 = 478.32 : x
  2. Step 2: Convert to fraction form
    495.84/685.11 = 478.32/x
  3. Step 3: Cross multiply
    495.84x = 685.11 × 478.32
  4. Step 4: Simplify right side
    495.84x = 327,701.82
  5. Step 5: Solve for x
    x = 327,701.82/495.84
  6. Step 6: Final answer
    x = 660.90

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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.