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Finding the Fourth Proportional to 100,921.90, 139,166.64 and 75,388.24

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Solution

The fourth proportional to 100,921.90, 139,166.64 and 75,388.24 is: 103,956.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,921.90 : 139,166.64 = 75,388.24 : x
  2. Step 2: Convert to fraction form
    100,921.90/139,166.64 = 75,388.24/x
  3. Step 3: Cross multiply
    100,921.90x = 139,166.64 × 75,388.24
  4. Step 4: Simplify right side
    100,921.90x = 10,491,528,056.31
  5. Step 5: Solve for x
    x = 10,491,528,056.31/100,921.90
  6. Step 6: Final answer
    x = 103,956.90

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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.