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Finding the Fourth Proportional to 702.74, 1,054.28 and 215.80

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Solution

The fourth proportional to 702.74, 1,054.28 and 215.80 is: 323.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.74 : 1,054.28 = 215.80 : x
  2. Step 2: Convert to fraction form
    702.74/1,054.28 = 215.80/x
  3. Step 3: Cross multiply
    702.74x = 1,054.28 × 215.80
  4. Step 4: Simplify right side
    702.74x = 227,511.53
  5. Step 5: Solve for x
    x = 227,511.53/702.74
  6. Step 6: Final answer
    x = 323.75

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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.