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Finding the Fourth Proportional to 702.85, 1,055.08 and 378.85

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Solution

The fourth proportional to 702.85, 1,055.08 and 378.85 is: 568.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.85 : 1,055.08 = 378.85 : x
  2. Step 2: Convert to fraction form
    702.85/1,055.08 = 378.85/x
  3. Step 3: Cross multiply
    702.85x = 1,055.08 × 378.85
  4. Step 4: Simplify right side
    702.85x = 399,717.06
  5. Step 5: Solve for x
    x = 399,717.06/702.85
  6. Step 6: Final answer
    x = 568.71

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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.