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Finding the Fourth Proportional to 72,129.40, 107,999.70 and 52,300.60

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Solution

The fourth proportional to 72,129.40, 107,999.70 and 52,300.60 is: 78,309.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,129.40 : 107,999.70 = 52,300.60 : x
  2. Step 2: Convert to fraction form
    72,129.40/107,999.70 = 52,300.60/x
  3. Step 3: Cross multiply
    72,129.40x = 107,999.70 × 52,300.60
  4. Step 4: Simplify right side
    72,129.40x = 5,648,449,109.82
  5. Step 5: Solve for x
    x = 5,648,449,109.82/72,129.40
  6. Step 6: Final answer
    x = 78,309.94

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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.