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Finding the Fourth Proportional to 100,987.08, 139,495.28 and 75,449.06

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Solution

The fourth proportional to 100,987.08, 139,495.28 and 75,449.06 is: 104,219.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,987.08 : 139,495.28 = 75,449.06 : x
  2. Step 2: Convert to fraction form
    100,987.08/139,495.28 = 75,449.06/x
  3. Step 3: Cross multiply
    100,987.08x = 139,495.28 × 75,449.06
  4. Step 4: Simplify right side
    100,987.08x = 10,524,787,750.44
  5. Step 5: Solve for x
    x = 10,524,787,750.44/100,987.08
  6. Step 6: Final answer
    x = 104,219.15

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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.