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Finding the Fourth Proportional to 212.72, 292.88 and 188.40

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Solution

The fourth proportional to 212.72, 292.88 and 188.40 is: 259.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.72 : 292.88 = 188.40 : x
  2. Step 2: Convert to fraction form
    212.72/292.88 = 188.40/x
  3. Step 3: Cross multiply
    212.72x = 292.88 × 188.40
  4. Step 4: Simplify right side
    212.72x = 55,178.59
  5. Step 5: Solve for x
    x = 55,178.59/212.72
  6. Step 6: Final answer
    x = 259.40

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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.