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Finding the Fourth Proportional to 212.96, 293.64 and 139.28

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Solution

The fourth proportional to 212.96, 293.64 and 139.28 is: 192.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.96 : 293.64 = 139.28 : x
  2. Step 2: Convert to fraction form
    212.96/293.64 = 139.28/x
  3. Step 3: Cross multiply
    212.96x = 293.64 × 139.28
  4. Step 4: Simplify right side
    212.96x = 40,898.18
  5. Step 5: Solve for x
    x = 40,898.18/212.96
  6. Step 6: Final answer
    x = 192.05

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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.