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Finding the Fourth Proportional to 73,800.12, 110,700.90 and 21,210

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Solution

The fourth proportional to 73,800.12, 110,700.90 and 21,210 is: 31,815.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,800.12 : 110,700.90 = 21,210 : x
  2. Step 2: Convert to fraction form
    73,800.12/110,700.90 = 21,210/x
  3. Step 3: Cross multiply
    73,800.12x = 110,700.90 × 21,210
  4. Step 4: Simplify right side
    73,800.12x = 2,347,966,089
  5. Step 5: Solve for x
    x = 2,347,966,089/73,800.12
  6. Step 6: Final answer
    x = 31,815.21

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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.