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Finding the Fourth Proportional to 272,904.40, 409,356.60 and 85,915.90

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Solution

The fourth proportional to 272,904.40, 409,356.60 and 85,915.90 is: 128,873.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,904.40 : 409,356.60 = 85,915.90 : x
  2. Step 2: Convert to fraction form
    272,904.40/409,356.60 = 85,915.90/x
  3. Step 3: Cross multiply
    272,904.40x = 409,356.60 × 85,915.90
  4. Step 4: Simplify right side
    272,904.40x = 35,170,240,709.94
  5. Step 5: Solve for x
    x = 35,170,240,709.94/272,904.40
  6. Step 6: Final answer
    x = 128,873.85

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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.