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Finding the Fourth Proportional to 310.61, 428.67 and 186.28

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Solution

The fourth proportional to 310.61, 428.67 and 186.28 is: 257.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.61 : 428.67 = 186.28 : x
  2. Step 2: Convert to fraction form
    310.61/428.67 = 186.28/x
  3. Step 3: Cross multiply
    310.61x = 428.67 × 186.28
  4. Step 4: Simplify right side
    310.61x = 79,851.58
  5. Step 5: Solve for x
    x = 79,851.58/310.61
  6. Step 6: Final answer
    x = 257.08

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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.