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Finding the Fourth Proportional to 688.90, 949.88 and 468

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Solution

The fourth proportional to 688.90, 949.88 and 468 is: 645.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.90 : 949.88 = 468 : x
  2. Step 2: Convert to fraction form
    688.90/949.88 = 468/x
  3. Step 3: Cross multiply
    688.90x = 949.88 × 468
  4. Step 4: Simplify right side
    688.90x = 444,543.84
  5. Step 5: Solve for x
    x = 444,543.84/688.90
  6. Step 6: Final answer
    x = 645.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.