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Finding the Fourth Proportional to 438.12, 604.40 and 307.17

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Solution

The fourth proportional to 438.12, 604.40 and 307.17 is: 423.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.12 : 604.40 = 307.17 : x
  2. Step 2: Convert to fraction form
    438.12/604.40 = 307.17/x
  3. Step 3: Cross multiply
    438.12x = 604.40 × 307.17
  4. Step 4: Simplify right side
    438.12x = 185,652.01
  5. Step 5: Solve for x
    x = 185,652.01/438.12
  6. Step 6: Final answer
    x = 423.75

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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.