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Finding the Fourth Proportional to 674.90, 1,011.45 and 482.30

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Solution

The fourth proportional to 674.90, 1,011.45 and 482.30 is: 722.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.90 : 1,011.45 = 482.30 : x
  2. Step 2: Convert to fraction form
    674.90/1,011.45 = 482.30/x
  3. Step 3: Cross multiply
    674.90x = 1,011.45 × 482.30
  4. Step 4: Simplify right side
    674.90x = 487,822.34
  5. Step 5: Solve for x
    x = 487,822.34/674.90
  6. Step 6: Final answer
    x = 722.81

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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.