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Finding the Fourth Proportional to 100,687.86, 138,949.02 and 55,368.63

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Solution

The fourth proportional to 100,687.86, 138,949.02 and 55,368.63 is: 76,408.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,687.86 : 138,949.02 = 55,368.63 : x
  2. Step 2: Convert to fraction form
    100,687.86/138,949.02 = 55,368.63/x
  3. Step 3: Cross multiply
    100,687.86x = 138,949.02 × 55,368.63
  4. Step 4: Simplify right side
    100,687.86x = 7,693,416,877.24
  5. Step 5: Solve for x
    x = 7,693,416,877.24/100,687.86
  6. Step 6: Final answer
    x = 76,408.58

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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.