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Finding the Fourth Proportional to 509.99, 703.72 and 288.92

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Solution

The fourth proportional to 509.99, 703.72 and 288.92 is: 398.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.99 : 703.72 = 288.92 : x
  2. Step 2: Convert to fraction form
    509.99/703.72 = 288.92/x
  3. Step 3: Cross multiply
    509.99x = 703.72 × 288.92
  4. Step 4: Simplify right side
    509.99x = 203,320.90
  5. Step 5: Solve for x
    x = 203,320.90/509.99
  6. Step 6: Final answer
    x = 398.68

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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.