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Finding the Fourth Proportional to 206,989.80, 310,484.70 and 74,020.20

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Solution

The fourth proportional to 206,989.80, 310,484.70 and 74,020.20 is: 111,030.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,989.80 : 310,484.70 = 74,020.20 : x
  2. Step 2: Convert to fraction form
    206,989.80/310,484.70 = 74,020.20/x
  3. Step 3: Cross multiply
    206,989.80x = 310,484.70 × 74,020.20
  4. Step 4: Simplify right side
    206,989.80x = 22,982,139,590.94
  5. Step 5: Solve for x
    x = 22,982,139,590.94/206,989.80
  6. Step 6: Final answer
    x = 111,030.30

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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.