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Finding the Fourth Proportional to 138,402.08, 191,009 and 84,722.56

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Solution

The fourth proportional to 138,402.08, 191,009 and 84,722.56 is: 116,925.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,402.08 : 191,009 = 84,722.56 : x
  2. Step 2: Convert to fraction form
    138,402.08/191,009 = 84,722.56/x
  3. Step 3: Cross multiply
    138,402.08x = 191,009 × 84,722.56
  4. Step 4: Simplify right side
    138,402.08x = 16,182,771,463.04
  5. Step 5: Solve for x
    x = 16,182,771,463.04/138,402.08
  6. Step 6: Final answer
    x = 116,925.78

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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.