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Finding the Fourth Proportional to 162.96, 245.76 and 139.20

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Solution

The fourth proportional to 162.96, 245.76 and 139.20 is: 209.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.96 : 245.76 = 139.20 : x
  2. Step 2: Convert to fraction form
    162.96/245.76 = 139.20/x
  3. Step 3: Cross multiply
    162.96x = 245.76 × 139.20
  4. Step 4: Simplify right side
    162.96x = 34,209.79
  5. Step 5: Solve for x
    x = 34,209.79/162.96
  6. Step 6: Final answer
    x = 209.93

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.