Home / 81,430.40-122,145.60-67,606.40

Finding the Fourth Proportional to 81,430.40, 122,145.60 and 67,606.40

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Solution

The fourth proportional to 81,430.40, 122,145.60 and 67,606.40 is: 101,409.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,430.40 : 122,145.60 = 67,606.40 : x
  2. Step 2: Convert to fraction form
    81,430.40/122,145.60 = 67,606.40/x
  3. Step 3: Cross multiply
    81,430.40x = 122,145.60 × 67,606.40
  4. Step 4: Simplify right side
    81,430.40x = 8,257,824,291.84
  5. Step 5: Solve for x
    x = 8,257,824,291.84/81,430.40
  6. Step 6: Final answer
    x = 101,409.60

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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.