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Finding the Fourth Proportional to 86,680.20, 130,020.30 and 76,657.80

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Solution

The fourth proportional to 86,680.20, 130,020.30 and 76,657.80 is: 114,986.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,680.20 : 130,020.30 = 76,657.80 : x
  2. Step 2: Convert to fraction form
    86,680.20/130,020.30 = 76,657.80/x
  3. Step 3: Cross multiply
    86,680.20x = 130,020.30 × 76,657.80
  4. Step 4: Simplify right side
    86,680.20x = 9,967,070,153.34
  5. Step 5: Solve for x
    x = 9,967,070,153.34/86,680.20
  6. Step 6: Final answer
    x = 114,986.70

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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.