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Finding the Fourth Proportional to 86,121.54, 118,957.95 and 65,855.34

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Solution

The fourth proportional to 86,121.54, 118,957.95 and 65,855.34 is: 90,964.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,121.54 : 118,957.95 = 65,855.34 : x
  2. Step 2: Convert to fraction form
    86,121.54/118,957.95 = 65,855.34/x
  3. Step 3: Cross multiply
    86,121.54x = 118,957.95 × 65,855.34
  4. Step 4: Simplify right side
    86,121.54x = 7,834,016,242.95
  5. Step 5: Solve for x
    x = 7,834,016,242.95/86,121.54
  6. Step 6: Final answer
    x = 90,964.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.