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Finding the Fourth Proportional to 438.59, 605.90 and 339.87

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Solution

The fourth proportional to 438.59, 605.90 and 339.87 is: 469.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.59 : 605.90 = 339.87 : x
  2. Step 2: Convert to fraction form
    438.59/605.90 = 339.87/x
  3. Step 3: Cross multiply
    438.59x = 605.90 × 339.87
  4. Step 4: Simplify right side
    438.59x = 205,925.53
  5. Step 5: Solve for x
    x = 205,925.53/438.59
  6. Step 6: Final answer
    x = 469.52

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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.