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Finding the Fourth Proportional to 78,999.29, 109,019.41 and 43,189.30

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Solution

The fourth proportional to 78,999.29, 109,019.41 and 43,189.30 is: 59,601.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,999.29 : 109,019.41 = 43,189.30 : x
  2. Step 2: Convert to fraction form
    78,999.29/109,019.41 = 43,189.30/x
  3. Step 3: Cross multiply
    78,999.29x = 109,019.41 × 43,189.30
  4. Step 4: Simplify right side
    78,999.29x = 4,708,472,004.31
  5. Step 5: Solve for x
    x = 4,708,472,004.31/78,999.29
  6. Step 6: Final answer
    x = 59,601.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.