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Finding the Fourth Proportional to 673.20, 928.80 and 475.20

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Solution

The fourth proportional to 673.20, 928.80 and 475.20 is: 655.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.20 : 928.80 = 475.20 : x
  2. Step 2: Convert to fraction form
    673.20/928.80 = 475.20/x
  3. Step 3: Cross multiply
    673.20x = 928.80 × 475.20
  4. Step 4: Simplify right side
    673.20x = 441,365.76
  5. Step 5: Solve for x
    x = 441,365.76/673.20
  6. Step 6: Final answer
    x = 655.62

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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.