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Finding the Fourth Proportional to 501.39, 690.05 and 353.77

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Solution

The fourth proportional to 501.39, 690.05 and 353.77 is: 486.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.39 : 690.05 = 353.77 : x
  2. Step 2: Convert to fraction form
    501.39/690.05 = 353.77/x
  3. Step 3: Cross multiply
    501.39x = 690.05 × 353.77
  4. Step 4: Simplify right side
    501.39x = 244,118.15
  5. Step 5: Solve for x
    x = 244,118.15/501.39
  6. Step 6: Final answer
    x = 486.88

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Double scale
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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.