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Finding the Fourth Proportional to 509.70, 703.45 and 288.69

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Solution

The fourth proportional to 509.70, 703.45 and 288.69 is: 398.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.70 : 703.45 = 288.69 : x
  2. Step 2: Convert to fraction form
    509.70/703.45 = 288.69/x
  3. Step 3: Cross multiply
    509.70x = 703.45 × 288.69
  4. Step 4: Simplify right side
    509.70x = 203,078.98
  5. Step 5: Solve for x
    x = 203,078.98/509.70
  6. Step 6: Final answer
    x = 398.43

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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.