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Finding the Fourth Proportional to 459.99, 689.91 and 135.39

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Solution

The fourth proportional to 459.99, 689.91 and 135.39 is: 203.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.99 : 689.91 = 135.39 : x
  2. Step 2: Convert to fraction form
    459.99/689.91 = 135.39/x
  3. Step 3: Cross multiply
    459.99x = 689.91 × 135.39
  4. Step 4: Simplify right side
    459.99x = 93,406.91
  5. Step 5: Solve for x
    x = 93,406.91/459.99
  6. Step 6: Final answer
    x = 203.06

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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.