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Finding the Fourth Proportional to 438.74, 605.49 and 307.70

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Solution

The fourth proportional to 438.74, 605.49 and 307.70 is: 424.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.74 : 605.49 = 307.70 : x
  2. Step 2: Convert to fraction form
    438.74/605.49 = 307.70/x
  3. Step 3: Cross multiply
    438.74x = 605.49 × 307.70
  4. Step 4: Simplify right side
    438.74x = 186,309.27
  5. Step 5: Solve for x
    x = 186,309.27/438.74
  6. Step 6: Final answer
    x = 424.65

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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.