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Finding the Fourth Proportional to 480.80, 663.60 and 315.16

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Solution

The fourth proportional to 480.80, 663.60 and 315.16 is: 434.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.80 : 663.60 = 315.16 : x
  2. Step 2: Convert to fraction form
    480.80/663.60 = 315.16/x
  3. Step 3: Cross multiply
    480.80x = 663.60 × 315.16
  4. Step 4: Simplify right side
    480.80x = 209,140.18
  5. Step 5: Solve for x
    x = 209,140.18/480.80
  6. Step 6: Final answer
    x = 434.98

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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.