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Finding the Fourth Proportional to 459.61, 687.89 and 340.23

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Solution

The fourth proportional to 459.61, 687.89 and 340.23 is: 509.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.61 : 687.89 = 340.23 : x
  2. Step 2: Convert to fraction form
    459.61/687.89 = 340.23/x
  3. Step 3: Cross multiply
    459.61x = 687.89 × 340.23
  4. Step 4: Simplify right side
    459.61x = 234,044.24
  5. Step 5: Solve for x
    x = 234,044.24/459.61
  6. Step 6: Final answer
    x = 509.23

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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.