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Finding the Fourth Proportional to 86,078.40, 128,878.08 and 43,867.46

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Solution

The fourth proportional to 86,078.40, 128,878.08 and 43,867.46 is: 65,679.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,078.40 : 128,878.08 = 43,867.46 : x
  2. Step 2: Convert to fraction form
    86,078.40/128,878.08 = 43,867.46/x
  3. Step 3: Cross multiply
    86,078.40x = 128,878.08 × 43,867.46
  4. Step 4: Simplify right side
    86,078.40x = 5,653,554,019.28
  5. Step 5: Solve for x
    x = 5,653,554,019.28/86,078.40
  6. Step 6: Final answer
    x = 65,679.13

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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.