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Finding the Fourth Proportional to 72,991.20, 109,490.40 and 37,999.20

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Solution

The fourth proportional to 72,991.20, 109,490.40 and 37,999.20 is: 57,000.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,991.20 : 109,490.40 = 37,999.20 : x
  2. Step 2: Convert to fraction form
    72,991.20/109,490.40 = 37,999.20/x
  3. Step 3: Cross multiply
    72,991.20x = 109,490.40 × 37,999.20
  4. Step 4: Simplify right side
    72,991.20x = 4,160,547,607.68
  5. Step 5: Solve for x
    x = 4,160,547,607.68/72,991.20
  6. Step 6: Final answer
    x = 57,000.67

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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.