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Finding the Fourth Proportional to 459.89, 690.17 and 286.80

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Solution

The fourth proportional to 459.89, 690.17 and 286.80 is: 430.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.89 : 690.17 = 286.80 : x
  2. Step 2: Convert to fraction form
    459.89/690.17 = 286.80/x
  3. Step 3: Cross multiply
    459.89x = 690.17 × 286.80
  4. Step 4: Simplify right side
    459.89x = 197,940.76
  5. Step 5: Solve for x
    x = 197,940.76/459.89
  6. Step 6: Final answer
    x = 430.41

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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.