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Finding the Fourth Proportional to 12,915.77, 19,374.53 and 5,520.20

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Solution

The fourth proportional to 12,915.77, 19,374.53 and 5,520.20 is: 8,280.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.77 : 19,374.53 = 5,520.20 : x
  2. Step 2: Convert to fraction form
    12,915.77/19,374.53 = 5,520.20/x
  3. Step 3: Cross multiply
    12,915.77x = 19,374.53 × 5,520.20
  4. Step 4: Simplify right side
    12,915.77x = 106,951,156.03
  5. Step 5: Solve for x
    x = 106,951,156.03/12,915.77
  6. Step 6: Final answer
    x = 8,280.67

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1.5x scale

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.