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Finding the Fourth Proportional to 218,612.64, 328,078.80 and 139,919.52

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Solution

The fourth proportional to 218,612.64, 328,078.80 and 139,919.52 is: 209,981.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,612.64 : 328,078.80 = 139,919.52 : x
  2. Step 2: Convert to fraction form
    218,612.64/328,078.80 = 139,919.52/x
  3. Step 3: Cross multiply
    218,612.64x = 328,078.80 × 139,919.52
  4. Step 4: Simplify right side
    218,612.64x = 45,904,628,218.18
  5. Step 5: Solve for x
    x = 45,904,628,218.18/218,612.64
  6. Step 6: Final answer
    x = 209,981.58

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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.