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Finding the Fourth Proportional to 509.77, 703.46 and 288.72

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Solution

The fourth proportional to 509.77, 703.46 and 288.72 is: 398.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.77 : 703.46 = 288.72 : x
  2. Step 2: Convert to fraction form
    509.77/703.46 = 288.72/x
  3. Step 3: Cross multiply
    509.77x = 703.46 × 288.72
  4. Step 4: Simplify right side
    509.77x = 203,098.01
  5. Step 5: Solve for x
    x = 203,098.01/509.77
  6. Step 6: Final answer
    x = 398.41

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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.