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Finding the Fourth Proportional to 468.91, 703.20 and 139.75

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Solution

The fourth proportional to 468.91, 703.20 and 139.75 is: 209.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.91 : 703.20 = 139.75 : x
  2. Step 2: Convert to fraction form
    468.91/703.20 = 139.75/x
  3. Step 3: Cross multiply
    468.91x = 703.20 × 139.75
  4. Step 4: Simplify right side
    468.91x = 98,272.20
  5. Step 5: Solve for x
    x = 98,272.20/468.91
  6. Step 6: Final answer
    x = 209.58

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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.