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Finding the Fourth Proportional to 86,287.65, 128,738.37 and 76,815.20

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Solution

The fourth proportional to 86,287.65, 128,738.37 and 76,815.20 is: 114,605.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,287.65 : 128,738.37 = 76,815.20 : x
  2. Step 2: Convert to fraction form
    86,287.65/128,738.37 = 76,815.20/x
  3. Step 3: Cross multiply
    86,287.65x = 128,738.37 × 76,815.20
  4. Step 4: Simplify right side
    86,287.65x = 9,889,062,995.53
  5. Step 5: Solve for x
    x = 9,889,062,995.53/86,287.65
  6. Step 6: Final answer
    x = 114,605.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.