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Finding the Fourth Proportional to 459.40, 687.90 and 437.80

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Solution

The fourth proportional to 459.40, 687.90 and 437.80 is: 655.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.40 : 687.90 = 437.80 : x
  2. Step 2: Convert to fraction form
    459.40/687.90 = 437.80/x
  3. Step 3: Cross multiply
    459.40x = 687.90 × 437.80
  4. Step 4: Simplify right side
    459.40x = 301,162.62
  5. Step 5: Solve for x
    x = 301,162.62/459.40
  6. Step 6: Final answer
    x = 655.56

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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.