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Finding the Fourth Proportional to 438.66, 605.38 and 307.98

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Solution

The fourth proportional to 438.66, 605.38 and 307.98 is: 425.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.66 : 605.38 = 307.98 : x
  2. Step 2: Convert to fraction form
    438.66/605.38 = 307.98/x
  3. Step 3: Cross multiply
    438.66x = 605.38 × 307.98
  4. Step 4: Simplify right side
    438.66x = 186,444.16
  5. Step 5: Solve for x
    x = 186,444.16/438.66
  6. Step 6: Final answer
    x = 425.03

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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.