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Finding the Fourth Proportional to 459.98, 634.41 and 390.23

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Solution

The fourth proportional to 459.98, 634.41 and 390.23 is: 538.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.98 : 634.41 = 390.23 : x
  2. Step 2: Convert to fraction form
    459.98/634.41 = 390.23/x
  3. Step 3: Cross multiply
    459.98x = 634.41 × 390.23
  4. Step 4: Simplify right side
    459.98x = 247,562.64
  5. Step 5: Solve for x
    x = 247,562.64/459.98
  6. Step 6: Final answer
    x = 538.21

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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.