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Finding the Fourth Proportional to 67,938.40, 101,907.60 and 21,191.20

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Solution

The fourth proportional to 67,938.40, 101,907.60 and 21,191.20 is: 31,786.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,938.40 : 101,907.60 = 21,191.20 : x
  2. Step 2: Convert to fraction form
    67,938.40/101,907.60 = 21,191.20/x
  3. Step 3: Cross multiply
    67,938.40x = 101,907.60 × 21,191.20
  4. Step 4: Simplify right side
    67,938.40x = 2,159,544,333.12
  5. Step 5: Solve for x
    x = 2,159,544,333.12/67,938.40
  6. Step 6: Final answer
    x = 31,786.80

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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.