Home / 66,139.20-99,208.80-38,145.60

Finding the Fourth Proportional to 66,139.20, 99,208.80 and 38,145.60

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Solution

The fourth proportional to 66,139.20, 99,208.80 and 38,145.60 is: 57,218.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,139.20 : 99,208.80 = 38,145.60 : x
  2. Step 2: Convert to fraction form
    66,139.20/99,208.80 = 38,145.60/x
  3. Step 3: Cross multiply
    66,139.20x = 99,208.80 × 38,145.60
  4. Step 4: Simplify right side
    66,139.20x = 3,784,379,201.28
  5. Step 5: Solve for x
    x = 3,784,379,201.28/66,139.20
  6. Step 6: Final answer
    x = 57,218.40

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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.