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Finding the Fourth Proportional to 501.11, 690.01 and 395.86

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Solution

The fourth proportional to 501.11, 690.01 and 395.86 is: 545.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.11 : 690.01 = 395.86 : x
  2. Step 2: Convert to fraction form
    501.11/690.01 = 395.86/x
  3. Step 3: Cross multiply
    501.11x = 690.01 × 395.86
  4. Step 4: Simplify right side
    501.11x = 273,143.91
  5. Step 5: Solve for x
    x = 273,143.91/501.11
  6. Step 6: Final answer
    x = 545.08

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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.