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Finding the Fourth Proportional to 465.40, 642.09 and 354.70

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Solution

The fourth proportional to 465.40, 642.09 and 354.70 is: 489.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.40 : 642.09 = 354.70 : x
  2. Step 2: Convert to fraction form
    465.40/642.09 = 354.70/x
  3. Step 3: Cross multiply
    465.40x = 642.09 × 354.70
  4. Step 4: Simplify right side
    465.40x = 227,749.32
  5. Step 5: Solve for x
    x = 227,749.32/465.40
  6. Step 6: Final answer
    x = 489.36

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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.