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Finding the Fourth Proportional to 405.83, 608.69 and 145.82

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Solution

The fourth proportional to 405.83, 608.69 and 145.82 is: 218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.83 : 608.69 = 145.82 : x
  2. Step 2: Convert to fraction form
    405.83/608.69 = 145.82/x
  3. Step 3: Cross multiply
    405.83x = 608.69 × 145.82
  4. Step 4: Simplify right side
    405.83x = 88,755.40
  5. Step 5: Solve for x
    x = 88,755.40/405.83
  6. Step 6: Final answer
    x = 218.70

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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.