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Finding the Fourth Proportional to 12,856.60, 19,264.95 and 8,915.54

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Solution

The fourth proportional to 12,856.60, 19,264.95 and 8,915.54 is: 13,359.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,856.60 : 19,264.95 = 8,915.54 : x
  2. Step 2: Convert to fraction form
    12,856.60/19,264.95 = 8,915.54/x
  3. Step 3: Cross multiply
    12,856.60x = 19,264.95 × 8,915.54
  4. Step 4: Simplify right side
    12,856.60x = 171,757,480.49
  5. Step 5: Solve for x
    x = 171,757,480.49/12,856.60
  6. Step 6: Final answer
    x = 13,359.48

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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.