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Finding the Fourth Proportional to 273,079.20, 409,618.80 and 139,915.20

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Solution

The fourth proportional to 273,079.20, 409,618.80 and 139,915.20 is: 209,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    273,079.20 : 409,618.80 = 139,915.20 : x
  2. Step 2: Convert to fraction form
    273,079.20/409,618.80 = 139,915.20/x
  3. Step 3: Cross multiply
    273,079.20x = 409,618.80 × 139,915.20
  4. Step 4: Simplify right side
    273,079.20x = 57,311,896,325.76
  5. Step 5: Solve for x
    x = 57,311,896,325.76/273,079.20
  6. Step 6: Final answer
    x = 209,872.80

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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.