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Finding the Fourth Proportional to 5,205.76, 7,801.52 and 1,915.68

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Solution

The fourth proportional to 5,205.76, 7,801.52 and 1,915.68 is: 2,870.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,205.76 : 7,801.52 = 1,915.68 : x
  2. Step 2: Convert to fraction form
    5,205.76/7,801.52 = 1,915.68/x
  3. Step 3: Cross multiply
    5,205.76x = 7,801.52 × 1,915.68
  4. Step 4: Simplify right side
    5,205.76x = 14,945,215.83
  5. Step 5: Solve for x
    x = 14,945,215.83/5,205.76
  6. Step 6: Final answer
    x = 2,870.90

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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.