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Finding the Fourth Proportional to 1,050.81, 1,451.08 and 678.42

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Solution

The fourth proportional to 1,050.81, 1,451.08 and 678.42 is: 936.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,050.81 : 1,451.08 = 678.42 : x
  2. Step 2: Convert to fraction form
    1,050.81/1,451.08 = 678.42/x
  3. Step 3: Cross multiply
    1,050.81x = 1,451.08 × 678.42
  4. Step 4: Simplify right side
    1,050.81x = 984,442.54
  5. Step 5: Solve for x
    x = 984,442.54/1,050.81
  6. Step 6: Final answer
    x = 936.84

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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.