Home / 81,427.20-122,140.80-67,430.40

Finding the Fourth Proportional to 81,427.20, 122,140.80 and 67,430.40

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Solution

The fourth proportional to 81,427.20, 122,140.80 and 67,430.40 is: 101,145.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,427.20 : 122,140.80 = 67,430.40 : x
  2. Step 2: Convert to fraction form
    81,427.20/122,140.80 = 67,430.40/x
  3. Step 3: Cross multiply
    81,427.20x = 122,140.80 × 67,430.40
  4. Step 4: Simplify right side
    81,427.20x = 8,236,003,000.32
  5. Step 5: Solve for x
    x = 8,236,003,000.32/81,427.20
  6. Step 6: Final answer
    x = 101,145.60

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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.