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Finding the Fourth Proportional to 538.68, 807.18 and 393.72

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Solution

The fourth proportional to 538.68, 807.18 and 393.72 is: 589.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.68 : 807.18 = 393.72 : x
  2. Step 2: Convert to fraction form
    538.68/807.18 = 393.72/x
  3. Step 3: Cross multiply
    538.68x = 807.18 × 393.72
  4. Step 4: Simplify right side
    538.68x = 317,802.91
  5. Step 5: Solve for x
    x = 317,802.91/538.68
  6. Step 6: Final answer
    x = 589.97

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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.