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Finding the Fourth Proportional to 1,318.17, 1,980.84 and 702.31

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Solution

The fourth proportional to 1,318.17, 1,980.84 and 702.31 is: 1,055.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.17 : 1,980.84 = 702.31 : x
  2. Step 2: Convert to fraction form
    1,318.17/1,980.84 = 702.31/x
  3. Step 3: Cross multiply
    1,318.17x = 1,980.84 × 702.31
  4. Step 4: Simplify right side
    1,318.17x = 1,391,163.74
  5. Step 5: Solve for x
    x = 1,391,163.74/1,318.17
  6. Step 6: Final answer
    x = 1,055.38

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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.