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Finding the Fourth Proportional to 459.20, 689.60 and 243.20

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Solution

The fourth proportional to 459.20, 689.60 and 243.20 is: 365.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.20 : 689.60 = 243.20 : x
  2. Step 2: Convert to fraction form
    459.20/689.60 = 243.20/x
  3. Step 3: Cross multiply
    459.20x = 689.60 × 243.20
  4. Step 4: Simplify right side
    459.20x = 167,710.72
  5. Step 5: Solve for x
    x = 167,710.72/459.20
  6. Step 6: Final answer
    x = 365.22

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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.