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Finding the Fourth Proportional to 212,843.60, 318,871.80 and 124,139.60

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Solution

The fourth proportional to 212,843.60, 318,871.80 and 124,139.60 is: 185,979.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,843.60 : 318,871.80 = 124,139.60 : x
  2. Step 2: Convert to fraction form
    212,843.60/318,871.80 = 124,139.60/x
  3. Step 3: Cross multiply
    212,843.60x = 318,871.80 × 124,139.60
  4. Step 4: Simplify right side
    212,843.60x = 39,584,617,703.28
  5. Step 5: Solve for x
    x = 39,584,617,703.28/212,843.60
  6. Step 6: Final answer
    x = 185,979.84

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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.