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Finding the Fourth Proportional to 678.51, 936.04 and 520.86

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Solution

The fourth proportional to 678.51, 936.04 and 520.86 is: 718.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.51 : 936.04 = 520.86 : x
  2. Step 2: Convert to fraction form
    678.51/936.04 = 520.86/x
  3. Step 3: Cross multiply
    678.51x = 936.04 × 520.86
  4. Step 4: Simplify right side
    678.51x = 487,543.19
  5. Step 5: Solve for x
    x = 487,543.19/678.51
  6. Step 6: Final answer
    x = 718.56

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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.