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Finding the Fourth Proportional to 638.70, 959.28 and 530.52

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Solution

The fourth proportional to 638.70, 959.28 and 530.52 is: 796.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.70 : 959.28 = 530.52 : x
  2. Step 2: Convert to fraction form
    638.70/959.28 = 530.52/x
  3. Step 3: Cross multiply
    638.70x = 959.28 × 530.52
  4. Step 4: Simplify right side
    638.70x = 508,917.23
  5. Step 5: Solve for x
    x = 508,917.23/638.70
  6. Step 6: Final answer
    x = 796.80

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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.