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Finding the Fourth Proportional to 272,041.20, 408,061.80 and 105,721.20

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Solution

The fourth proportional to 272,041.20, 408,061.80 and 105,721.20 is: 158,581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,041.20 : 408,061.80 = 105,721.20 : x
  2. Step 2: Convert to fraction form
    272,041.20/408,061.80 = 105,721.20/x
  3. Step 3: Cross multiply
    272,041.20x = 408,061.80 × 105,721.20
  4. Step 4: Simplify right side
    272,041.20x = 43,140,783,170.16
  5. Step 5: Solve for x
    x = 43,140,783,170.16/272,041.20
  6. Step 6: Final answer
    x = 158,581.80

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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.