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Finding the Fourth Proportional to 368,915.02, 509,139.05 and 215,943.94

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Solution

The fourth proportional to 368,915.02, 509,139.05 and 215,943.94 is: 298,023.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    368,915.02 : 509,139.05 = 215,943.94 : x
  2. Step 2: Convert to fraction form
    368,915.02/509,139.05 = 215,943.94/x
  3. Step 3: Cross multiply
    368,915.02x = 509,139.05 × 215,943.94
  4. Step 4: Simplify right side
    368,915.02x = 109,945,492,021.56
  5. Step 5: Solve for x
    x = 109,945,492,021.56/368,915.02
  6. Step 6: Final answer
    x = 298,023.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.