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Finding the Fourth Proportional to 224.64, 309.12 and 187.20

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Solution

The fourth proportional to 224.64, 309.12 and 187.20 is: 257.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.64 : 309.12 = 187.20 : x
  2. Step 2: Convert to fraction form
    224.64/309.12 = 187.20/x
  3. Step 3: Cross multiply
    224.64x = 309.12 × 187.20
  4. Step 4: Simplify right side
    224.64x = 57,867.26
  5. Step 5: Solve for x
    x = 57,867.26/224.64
  6. Step 6: Final answer
    x = 257.60

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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.