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Finding the Fourth Proportional to 439.82, 607.15 and 307.25

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Solution

The fourth proportional to 439.82, 607.15 and 307.25 is: 424.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.82 : 607.15 = 307.25 : x
  2. Step 2: Convert to fraction form
    439.82/607.15 = 307.25/x
  3. Step 3: Cross multiply
    439.82x = 607.15 × 307.25
  4. Step 4: Simplify right side
    439.82x = 186,546.84
  5. Step 5: Solve for x
    x = 186,546.84/439.82
  6. Step 6: Final answer
    x = 424.14

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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.