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Finding the Fourth Proportional to 100,676.17, 138,934.05 and 55,354.45

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Solution

The fourth proportional to 100,676.17, 138,934.05 and 55,354.45 is: 76,389.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,676.17 : 138,934.05 = 55,354.45 : x
  2. Step 2: Convert to fraction form
    100,676.17/138,934.05 = 55,354.45/x
  3. Step 3: Cross multiply
    100,676.17x = 138,934.05 × 55,354.45
  4. Step 4: Simplify right side
    100,676.17x = 7,690,617,924.02
  5. Step 5: Solve for x
    x = 7,690,617,924.02/100,676.17
  6. Step 6: Final answer
    x = 76,389.66

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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.