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Finding the Fourth Proportional to 438.88, 605.36 and 308.16

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Solution

The fourth proportional to 438.88, 605.36 and 308.16 is: 425.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.88 : 605.36 = 308.16 : x
  2. Step 2: Convert to fraction form
    438.88/605.36 = 308.16/x
  3. Step 3: Cross multiply
    438.88x = 605.36 × 308.16
  4. Step 4: Simplify right side
    438.88x = 186,547.74
  5. Step 5: Solve for x
    x = 186,547.74/438.88
  6. Step 6: Final answer
    x = 425.05

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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.