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Finding the Fourth Proportional to 55,681, 83,519.86 and 20,619.88

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Solution

The fourth proportional to 55,681, 83,519.86 and 20,619.88 is: 30,929.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,681 : 83,519.86 = 20,619.88 : x
  2. Step 2: Convert to fraction form
    55,681/83,519.86 = 20,619.88/x
  3. Step 3: Cross multiply
    55,681x = 83,519.86 × 20,619.88
  4. Step 4: Simplify right side
    55,681x = 1,722,169,490.82
  5. Step 5: Solve for x
    x = 1,722,169,490.82/55,681
  6. Step 6: Final answer
    x = 30,929.21

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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.