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Finding the Fourth Proportional to 678.04, 936.15 and 520.39

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Solution

The fourth proportional to 678.04, 936.15 and 520.39 is: 718.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.04 : 936.15 = 520.39 : x
  2. Step 2: Convert to fraction form
    678.04/936.15 = 520.39/x
  3. Step 3: Cross multiply
    678.04x = 936.15 × 520.39
  4. Step 4: Simplify right side
    678.04x = 487,162.24
  5. Step 5: Solve for x
    x = 487,162.24/678.04
  6. Step 6: Final answer
    x = 718.49

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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.