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Finding the Fourth Proportional to 519.70, 778.70 and 288.02

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Solution

The fourth proportional to 519.70, 778.70 and 288.02 is: 431.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.70 : 778.70 = 288.02 : x
  2. Step 2: Convert to fraction form
    519.70/778.70 = 288.02/x
  3. Step 3: Cross multiply
    519.70x = 778.70 × 288.02
  4. Step 4: Simplify right side
    519.70x = 224,281.17
  5. Step 5: Solve for x
    x = 224,281.17/519.70
  6. Step 6: Final answer
    x = 431.56

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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.