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Finding the Fourth Proportional to 405.36, 607.89 and 145.31

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Solution

The fourth proportional to 405.36, 607.89 and 145.31 is: 217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.36 : 607.89 = 145.31 : x
  2. Step 2: Convert to fraction form
    405.36/607.89 = 145.31/x
  3. Step 3: Cross multiply
    405.36x = 607.89 × 145.31
  4. Step 4: Simplify right side
    405.36x = 88,329.46
  5. Step 5: Solve for x
    x = 88,329.46/405.36
  6. Step 6: Final answer
    x = 217.90

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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.