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Finding the Fourth Proportional to 673.21, 929.12 and 407.68

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Solution

The fourth proportional to 673.21, 929.12 and 407.68 is: 562.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.21 : 929.12 = 407.68 : x
  2. Step 2: Convert to fraction form
    673.21/929.12 = 407.68/x
  3. Step 3: Cross multiply
    673.21x = 929.12 × 407.68
  4. Step 4: Simplify right side
    673.21x = 378,780.81
  5. Step 5: Solve for x
    x = 378,780.81/673.21
  6. Step 6: Final answer
    x = 562.65

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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.