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Finding the Fourth Proportional to 72,991.70, 109,491.15 and 37,999.70

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Solution

The fourth proportional to 72,991.70, 109,491.15 and 37,999.70 is: 57,001.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.70 : 109,491.15 = 37,999.70 : x
  2. Step 2: Convert to fraction form
    72,991.70/109,491.15 = 37,999.70/x
  3. Step 3: Cross multiply
    72,991.70x = 109,491.15 × 37,999.70
  4. Step 4: Simplify right side
    72,991.70x = 4,160,630,852.66
  5. Step 5: Solve for x
    x = 4,160,630,852.66/72,991.70
  6. Step 6: Final answer
    x = 57,001.42

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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.