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Finding the Fourth Proportional to 86,638.60, 129,970.92 and 36,718.96

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Solution

The fourth proportional to 86,638.60, 129,970.92 and 36,718.96 is: 55,083.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,638.60 : 129,970.92 = 36,718.96 : x
  2. Step 2: Convert to fraction form
    86,638.60/129,970.92 = 36,718.96/x
  3. Step 3: Cross multiply
    86,638.60x = 129,970.92 × 36,718.96
  4. Step 4: Simplify right side
    86,638.60x = 4,772,397,012.64
  5. Step 5: Solve for x
    x = 4,772,397,012.64/86,638.60
  6. Step 6: Final answer
    x = 55,083.96

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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.