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Finding the Fourth Proportional to 628, 866.64 and 480.80

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Solution

The fourth proportional to 628, 866.64 and 480.80 is: 663.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    628 : 866.64 = 480.80 : x
  2. Step 2: Convert to fraction form
    628/866.64 = 480.80/x
  3. Step 3: Cross multiply
    628x = 866.64 × 480.80
  4. Step 4: Simplify right side
    628x = 416,680.51
  5. Step 5: Solve for x
    x = 416,680.51/628
  6. Step 6: Final answer
    x = 663.50

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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.