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Finding the Fourth Proportional to 493.20, 740.28 and 288.72

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Solution

The fourth proportional to 493.20, 740.28 and 288.72 is: 433.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.20 : 740.28 = 288.72 : x
  2. Step 2: Convert to fraction form
    493.20/740.28 = 288.72/x
  3. Step 3: Cross multiply
    493.20x = 740.28 × 288.72
  4. Step 4: Simplify right side
    493.20x = 213,733.64
  5. Step 5: Solve for x
    x = 213,733.64/493.20
  6. Step 6: Final answer
    x = 433.36

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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.