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Finding the Fourth Proportional to 562.42, 839.66 and 431.74

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Solution

The fourth proportional to 562.42, 839.66 and 431.74 is: 644.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    562.42 : 839.66 = 431.74 : x
  2. Step 2: Convert to fraction form
    562.42/839.66 = 431.74/x
  3. Step 3: Cross multiply
    562.42x = 839.66 × 431.74
  4. Step 4: Simplify right side
    562.42x = 362,514.81
  5. Step 5: Solve for x
    x = 362,514.81/562.42
  6. Step 6: Final answer
    x = 644.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.