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Finding the Fourth Proportional to 538.81, 808.62 and 431.89

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Solution

The fourth proportional to 538.81, 808.62 and 431.89 is: 648.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.81 : 808.62 = 431.89 : x
  2. Step 2: Convert to fraction form
    538.81/808.62 = 431.89/x
  3. Step 3: Cross multiply
    538.81x = 808.62 × 431.89
  4. Step 4: Simplify right side
    538.81x = 349,237.52
  5. Step 5: Solve for x
    x = 349,237.52/538.81
  6. Step 6: Final answer
    x = 648.16

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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.