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Finding the Fourth Proportional to 459.27, 689.31 and 387.18

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Solution

The fourth proportional to 459.27, 689.31 and 387.18 is: 581.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.27 : 689.31 = 387.18 : x
  2. Step 2: Convert to fraction form
    459.27/689.31 = 387.18/x
  3. Step 3: Cross multiply
    459.27x = 689.31 × 387.18
  4. Step 4: Simplify right side
    459.27x = 266,887.05
  5. Step 5: Solve for x
    x = 266,887.05/459.27
  6. Step 6: Final answer
    x = 581.11

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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.