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Finding the Fourth Proportional to 501.20, 690.87 and 353.50

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Solution

The fourth proportional to 501.20, 690.87 and 353.50 is: 487.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.20 : 690.87 = 353.50 : x
  2. Step 2: Convert to fraction form
    501.20/690.87 = 353.50/x
  3. Step 3: Cross multiply
    501.20x = 690.87 × 353.50
  4. Step 4: Simplify right side
    501.20x = 244,222.55
  5. Step 5: Solve for x
    x = 244,222.55/501.20
  6. Step 6: Final answer
    x = 487.28

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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.