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Finding the Fourth Proportional to 211,989.60, 317,984.40 and 54,209.70

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Solution

The fourth proportional to 211,989.60, 317,984.40 and 54,209.70 is: 81,314.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,989.60 : 317,984.40 = 54,209.70 : x
  2. Step 2: Convert to fraction form
    211,989.60/317,984.40 = 54,209.70/x
  3. Step 3: Cross multiply
    211,989.60x = 317,984.40 × 54,209.70
  4. Step 4: Simplify right side
    211,989.60x = 17,237,838,928.68
  5. Step 5: Solve for x
    x = 17,237,838,928.68/211,989.60
  6. Step 6: Final answer
    x = 81,314.55

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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.