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Finding the Fourth Proportional to 138,718.54, 191,328.60 and 84,270.43

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Solution

The fourth proportional to 138,718.54, 191,328.60 and 84,270.43 is: 116,230.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.54 : 191,328.60 = 84,270.43 : x
  2. Step 2: Convert to fraction form
    138,718.54/191,328.60 = 84,270.43/x
  3. Step 3: Cross multiply
    138,718.54x = 191,328.60 × 84,270.43
  4. Step 4: Simplify right side
    138,718.54x = 16,123,343,393.30
  5. Step 5: Solve for x
    x = 16,123,343,393.30/138,718.54
  6. Step 6: Final answer
    x = 116,230.63

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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.