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Finding the Fourth Proportional to 138,215.76, 191,032.36 and 121,834.32

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Solution

The fourth proportional to 138,215.76, 191,032.36 and 121,834.32 is: 168,391.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,215.76 : 191,032.36 = 121,834.32 : x
  2. Step 2: Convert to fraction form
    138,215.76/191,032.36 = 121,834.32/x
  3. Step 3: Cross multiply
    138,215.76x = 191,032.36 × 121,834.32
  4. Step 4: Simplify right side
    138,215.76x = 23,274,297,678.60
  5. Step 5: Solve for x
    x = 23,274,297,678.60/138,215.76
  6. Step 6: Final answer
    x = 168,391.06

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1.5x scale

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.