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Finding the Fourth Proportional to 465.20, 696.90 and 259.40

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Solution

The fourth proportional to 465.20, 696.90 and 259.40 is: 388.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.20 : 696.90 = 259.40 : x
  2. Step 2: Convert to fraction form
    465.20/696.90 = 259.40/x
  3. Step 3: Cross multiply
    465.20x = 696.90 × 259.40
  4. Step 4: Simplify right side
    465.20x = 180,775.86
  5. Step 5: Solve for x
    x = 180,775.86/465.20
  6. Step 6: Final answer
    x = 388.60

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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.