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Finding the Fourth Proportional to 687.82, 948.88 and 478.50

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Solution

The fourth proportional to 687.82, 948.88 and 478.50 is: 660.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.82 : 948.88 = 478.50 : x
  2. Step 2: Convert to fraction form
    687.82/948.88 = 478.50/x
  3. Step 3: Cross multiply
    687.82x = 948.88 × 478.50
  4. Step 4: Simplify right side
    687.82x = 454,036.69
  5. Step 5: Solve for x
    x = 454,036.69/687.82
  6. Step 6: Final answer
    x = 660.11

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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.