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Finding the Fourth Proportional to 434.43, 652.86 and 405.90

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Solution

The fourth proportional to 434.43, 652.86 and 405.90 is: 609.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.43 : 652.86 = 405.90 : x
  2. Step 2: Convert to fraction form
    434.43/652.86 = 405.90/x
  3. Step 3: Cross multiply
    434.43x = 652.86 × 405.90
  4. Step 4: Simplify right side
    434.43x = 264,995.87
  5. Step 5: Solve for x
    x = 264,995.87/434.43
  6. Step 6: Final answer
    x = 609.99

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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.