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Finding the Fourth Proportional to 289,061.20, 433,721.40 and 131,208.40

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Solution

The fourth proportional to 289,061.20, 433,721.40 and 131,208.40 is: 196,871.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,061.20 : 433,721.40 = 131,208.40 : x
  2. Step 2: Convert to fraction form
    289,061.20/433,721.40 = 131,208.40/x
  3. Step 3: Cross multiply
    289,061.20x = 433,721.40 × 131,208.40
  4. Step 4: Simplify right side
    289,061.20x = 56,907,890,939.76
  5. Step 5: Solve for x
    x = 56,907,890,939.76/289,061.20
  6. Step 6: Final answer
    x = 196,871.43

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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.