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Finding the Fourth Proportional to 205,373.56, 307,928.52 and 85,513.56

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Solution

The fourth proportional to 205,373.56, 307,928.52 and 85,513.56 is: 128,215.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,373.56 : 307,928.52 = 85,513.56 : x
  2. Step 2: Convert to fraction form
    205,373.56/307,928.52 = 85,513.56/x
  3. Step 3: Cross multiply
    205,373.56x = 307,928.52 × 85,513.56
  4. Step 4: Simplify right side
    205,373.56x = 26,332,063,970.73
  5. Step 5: Solve for x
    x = 26,332,063,970.73/205,373.56
  6. Step 6: Final answer
    x = 128,215.45

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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.