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Finding the Fourth Proportional to 459.80, 687.90 and 416.60

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Solution

The fourth proportional to 459.80, 687.90 and 416.60 is: 623.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.80 : 687.90 = 416.60 : x
  2. Step 2: Convert to fraction form
    459.80/687.90 = 416.60/x
  3. Step 3: Cross multiply
    459.80x = 687.90 × 416.60
  4. Step 4: Simplify right side
    459.80x = 286,579.14
  5. Step 5: Solve for x
    x = 286,579.14/459.80
  6. Step 6: Final answer
    x = 623.27

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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.