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Finding the Fourth Proportional to 353,915.70, 530,873.55 and 221,205.30

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Solution

The fourth proportional to 353,915.70, 530,873.55 and 221,205.30 is: 331,807.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,915.70 : 530,873.55 = 221,205.30 : x
  2. Step 2: Convert to fraction form
    353,915.70/530,873.55 = 221,205.30/x
  3. Step 3: Cross multiply
    353,915.70x = 530,873.55 × 221,205.30
  4. Step 4: Simplify right side
    353,915.70x = 117,432,042,889.82
  5. Step 5: Solve for x
    x = 117,432,042,889.82/353,915.70
  6. Step 6: Final answer
    x = 331,807.95

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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.