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Finding the Fourth Proportional to 405.30, 607.20 and 231.74

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Solution

The fourth proportional to 405.30, 607.20 and 231.74 is: 347.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.30 : 607.20 = 231.74 : x
  2. Step 2: Convert to fraction form
    405.30/607.20 = 231.74/x
  3. Step 3: Cross multiply
    405.30x = 607.20 × 231.74
  4. Step 4: Simplify right side
    405.30x = 140,712.53
  5. Step 5: Solve for x
    x = 140,712.53/405.30
  6. Step 6: Final answer
    x = 347.18

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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.