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Finding the Fourth Proportional to 86,384.94, 129,357.09 and 68,880.30

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Solution

The fourth proportional to 86,384.94, 129,357.09 and 68,880.30 is: 103,144.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,384.94 : 129,357.09 = 68,880.30 : x
  2. Step 2: Convert to fraction form
    86,384.94/129,357.09 = 68,880.30/x
  3. Step 3: Cross multiply
    86,384.94x = 129,357.09 × 68,880.30
  4. Step 4: Simplify right side
    86,384.94x = 8,910,155,166.33
  5. Step 5: Solve for x
    x = 8,910,155,166.33/86,384.94
  6. Step 6: Final answer
    x = 103,144.77

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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.