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Finding the Fourth Proportional to 1,051.38, 1,450.71 and 678.78

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Solution

The fourth proportional to 1,051.38, 1,450.71 and 678.78 is: 936.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.38 : 1,450.71 = 678.78 : x
  2. Step 2: Convert to fraction form
    1,051.38/1,450.71 = 678.78/x
  3. Step 3: Cross multiply
    1,051.38x = 1,450.71 × 678.78
  4. Step 4: Simplify right side
    1,051.38x = 984,712.93
  5. Step 5: Solve for x
    x = 984,712.93/1,051.38
  6. Step 6: Final answer
    x = 936.59

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1.5x scale

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.