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Finding the Fourth Proportional to 673.92, 1,011.60 and 491.76

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Solution

The fourth proportional to 673.92, 1,011.60 and 491.76 is: 738.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.92 : 1,011.60 = 491.76 : x
  2. Step 2: Convert to fraction form
    673.92/1,011.60 = 491.76/x
  3. Step 3: Cross multiply
    673.92x = 1,011.60 × 491.76
  4. Step 4: Simplify right side
    673.92x = 497,464.42
  5. Step 5: Solve for x
    x = 497,464.42/673.92
  6. Step 6: Final answer
    x = 738.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.