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Finding the Fourth Proportional to 705.40, 1,056.94 and 678.40

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Solution

The fourth proportional to 705.40, 1,056.94 and 678.40 is: 1,016.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.40 : 1,056.94 = 678.40 : x
  2. Step 2: Convert to fraction form
    705.40/1,056.94 = 678.40/x
  3. Step 3: Cross multiply
    705.40x = 1,056.94 × 678.40
  4. Step 4: Simplify right side
    705.40x = 717,028.10
  5. Step 5: Solve for x
    x = 717,028.10/705.40
  6. Step 6: Final answer
    x = 1,016.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.