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Finding the Fourth Proportional to 468.90, 703.36 and 212.40

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Solution

The fourth proportional to 468.90, 703.36 and 212.40 is: 318.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.90 : 703.36 = 212.40 : x
  2. Step 2: Convert to fraction form
    468.90/703.36 = 212.40/x
  3. Step 3: Cross multiply
    468.90x = 703.36 × 212.40
  4. Step 4: Simplify right side
    468.90x = 149,393.66
  5. Step 5: Solve for x
    x = 149,393.66/468.90
  6. Step 6: Final answer
    x = 318.60

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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.