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Finding the Fourth Proportional to 678.51, 936.76 and 520.84

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Solution

The fourth proportional to 678.51, 936.76 and 520.84 is: 719.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.51 : 936.76 = 520.84 : x
  2. Step 2: Convert to fraction form
    678.51/936.76 = 520.84/x
  3. Step 3: Cross multiply
    678.51x = 936.76 × 520.84
  4. Step 4: Simplify right side
    678.51x = 487,896.09
  5. Step 5: Solve for x
    x = 487,896.09/678.51
  6. Step 6: Final answer
    x = 719.08

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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.