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Finding the Fourth Proportional to 501.28, 690.35 and 431.31

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Solution

The fourth proportional to 501.28, 690.35 and 431.31 is: 593.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.28 : 690.35 = 431.31 : x
  2. Step 2: Convert to fraction form
    501.28/690.35 = 431.31/x
  3. Step 3: Cross multiply
    501.28x = 690.35 × 431.31
  4. Step 4: Simplify right side
    501.28x = 297,754.86
  5. Step 5: Solve for x
    x = 297,754.86/501.28
  6. Step 6: Final answer
    x = 593.99

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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.