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Finding the Fourth Proportional to 86,647.30, 129,970.95 and 39,991.30

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Solution

The fourth proportional to 86,647.30, 129,970.95 and 39,991.30 is: 59,986.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,647.30 : 129,970.95 = 39,991.30 : x
  2. Step 2: Convert to fraction form
    86,647.30/129,970.95 = 39,991.30/x
  3. Step 3: Cross multiply
    86,647.30x = 129,970.95 × 39,991.30
  4. Step 4: Simplify right side
    86,647.30x = 5,197,707,252.74
  5. Step 5: Solve for x
    x = 5,197,707,252.74/86,647.30
  6. Step 6: Final answer
    x = 59,986.95

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Similar ratio
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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.