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Finding the Fourth Proportional to 72,891.51, 109,343.53 and 20,300.99

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Solution

The fourth proportional to 72,891.51, 109,343.53 and 20,300.99 is: 30,453.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,891.51 : 109,343.53 = 20,300.99 : x
  2. Step 2: Convert to fraction form
    72,891.51/109,343.53 = 20,300.99/x
  3. Step 3: Cross multiply
    72,891.51x = 109,343.53 × 20,300.99
  4. Step 4: Simplify right side
    72,891.51x = 2,219,781,807.59
  5. Step 5: Solve for x
    x = 2,219,781,807.59/72,891.51
  6. Step 6: Final answer
    x = 30,453.23

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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.