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Finding the Fourth Proportional to 209,138.12, 313,714.55 and 66,987.71

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Solution

The fourth proportional to 209,138.12, 313,714.55 and 66,987.71 is: 100,483.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,138.12 : 313,714.55 = 66,987.71 : x
  2. Step 2: Convert to fraction form
    209,138.12/313,714.55 = 66,987.71/x
  3. Step 3: Cross multiply
    209,138.12x = 313,714.55 × 66,987.71
  4. Step 4: Simplify right side
    209,138.12x = 21,015,019,298.18
  5. Step 5: Solve for x
    x = 21,015,019,298.18/209,138.12
  6. Step 6: Final answer
    x = 100,483.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.