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Finding the Fourth Proportional to 15,856.80, 23,756.40 and 12,919.20

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Solution

The fourth proportional to 15,856.80, 23,756.40 and 12,919.20 is: 19,355.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,856.80 : 23,756.40 = 12,919.20 : x
  2. Step 2: Convert to fraction form
    15,856.80/23,756.40 = 12,919.20/x
  3. Step 3: Cross multiply
    15,856.80x = 23,756.40 × 12,919.20
  4. Step 4: Simplify right side
    15,856.80x = 306,913,682.88
  5. Step 5: Solve for x
    x = 306,913,682.88/15,856.80
  6. Step 6: Final answer
    x = 19,355.34

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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.