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Finding the Fourth Proportional to 1,318.39, 1,978.46 and 702.55

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Solution

The fourth proportional to 1,318.39, 1,978.46 and 702.55 is: 1,054.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.39 : 1,978.46 = 702.55 : x
  2. Step 2: Convert to fraction form
    1,318.39/1,978.46 = 702.55/x
  3. Step 3: Cross multiply
    1,318.39x = 1,978.46 × 702.55
  4. Step 4: Simplify right side
    1,318.39x = 1,389,967.07
  5. Step 5: Solve for x
    x = 1,389,967.07/1,318.39
  6. Step 6: Final answer
    x = 1,054.29

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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.