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Finding the Fourth Proportional to 678.70, 936.43 and 430.31

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Solution

The fourth proportional to 678.70, 936.43 and 430.31 is: 593.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.70 : 936.43 = 430.31 : x
  2. Step 2: Convert to fraction form
    678.70/936.43 = 430.31/x
  3. Step 3: Cross multiply
    678.70x = 936.43 × 430.31
  4. Step 4: Simplify right side
    678.70x = 402,950.51
  5. Step 5: Solve for x
    x = 402,950.51/678.70
  6. Step 6: Final answer
    x = 593.71

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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.