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Finding the Fourth Proportional to 459.95, 634.64 and 285.21

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Solution

The fourth proportional to 459.95, 634.64 and 285.21 is: 393.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.95 : 634.64 = 285.21 : x
  2. Step 2: Convert to fraction form
    459.95/634.64 = 285.21/x
  3. Step 3: Cross multiply
    459.95x = 634.64 × 285.21
  4. Step 4: Simplify right side
    459.95x = 181,004.25
  5. Step 5: Solve for x
    x = 181,004.25/459.95
  6. Step 6: Final answer
    x = 393.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.