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Finding the Fourth Proportional to 1,318.53, 1,978.98 and 702.75

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Solution

The fourth proportional to 1,318.53, 1,978.98 and 702.75 is: 1,054.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.53 : 1,978.98 = 702.75 : x
  2. Step 2: Convert to fraction form
    1,318.53/1,978.98 = 702.75/x
  3. Step 3: Cross multiply
    1,318.53x = 1,978.98 × 702.75
  4. Step 4: Simplify right side
    1,318.53x = 1,390,728.20
  5. Step 5: Solve for x
    x = 1,390,728.20/1,318.53
  6. Step 6: Final answer
    x = 1,054.76

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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.