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Finding the Fourth Proportional to 306.48, 422.85 and 188.45

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Solution

The fourth proportional to 306.48, 422.85 and 188.45 is: 260.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.48 : 422.85 = 188.45 : x
  2. Step 2: Convert to fraction form
    306.48/422.85 = 188.45/x
  3. Step 3: Cross multiply
    306.48x = 422.85 × 188.45
  4. Step 4: Simplify right side
    306.48x = 79,686.08
  5. Step 5: Solve for x
    x = 79,686.08/306.48
  6. Step 6: Final answer
    x = 260.00

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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.