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Finding the Fourth Proportional to 468.40, 702.54 and 143.78

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Solution

The fourth proportional to 468.40, 702.54 and 143.78 is: 215.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.40 : 702.54 = 143.78 : x
  2. Step 2: Convert to fraction form
    468.40/702.54 = 143.78/x
  3. Step 3: Cross multiply
    468.40x = 702.54 × 143.78
  4. Step 4: Simplify right side
    468.40x = 101,011.20
  5. Step 5: Solve for x
    x = 101,011.20/468.40
  6. Step 6: Final answer
    x = 215.65

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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.