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Finding the Fourth Proportional to 86,618.80, 129,976.80 and 36,690.40

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Solution

The fourth proportional to 86,618.80, 129,976.80 and 36,690.40 is: 55,056.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,618.80 : 129,976.80 = 36,690.40 : x
  2. Step 2: Convert to fraction form
    86,618.80/129,976.80 = 36,690.40/x
  3. Step 3: Cross multiply
    86,618.80x = 129,976.80 × 36,690.40
  4. Step 4: Simplify right side
    86,618.80x = 4,768,900,782.72
  5. Step 5: Solve for x
    x = 4,768,900,782.72/86,618.80
  6. Step 6: Final answer
    x = 55,056.19

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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.