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Finding the Fourth Proportional to 207,712.80, 311,569.20 and 67,485.60

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Solution

The fourth proportional to 207,712.80, 311,569.20 and 67,485.60 is: 101,228.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,712.80 : 311,569.20 = 67,485.60 : x
  2. Step 2: Convert to fraction form
    207,712.80/311,569.20 = 67,485.60/x
  3. Step 3: Cross multiply
    207,712.80x = 311,569.20 × 67,485.60
  4. Step 4: Simplify right side
    207,712.80x = 21,026,434,403.52
  5. Step 5: Solve for x
    x = 21,026,434,403.52/207,712.80
  6. Step 6: Final answer
    x = 101,228.40

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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.