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Finding the Fourth Proportional to 310.40, 428.36 and 186.03

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Solution

The fourth proportional to 310.40, 428.36 and 186.03 is: 256.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.40 : 428.36 = 186.03 : x
  2. Step 2: Convert to fraction form
    310.40/428.36 = 186.03/x
  3. Step 3: Cross multiply
    310.40x = 428.36 × 186.03
  4. Step 4: Simplify right side
    310.40x = 79,686.88
  5. Step 5: Solve for x
    x = 79,686.88/310.40
  6. Step 6: Final answer
    x = 256.72

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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.