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Finding the Fourth Proportional to 84,005.57, 125,964.59 and 39,620.40

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Solution

The fourth proportional to 84,005.57, 125,964.59 and 39,620.40 is: 59,409.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,005.57 : 125,964.59 = 39,620.40 : x
  2. Step 2: Convert to fraction form
    84,005.57/125,964.59 = 39,620.40/x
  3. Step 3: Cross multiply
    84,005.57x = 125,964.59 × 39,620.40
  4. Step 4: Simplify right side
    84,005.57x = 4,990,767,243.53
  5. Step 5: Solve for x
    x = 4,990,767,243.53/84,005.57
  6. Step 6: Final answer
    x = 59,409.96

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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.