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Finding the Fourth Proportional to 12,345.28, 18,479.04 and 8,457.28

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Solution

The fourth proportional to 12,345.28, 18,479.04 and 8,457.28 is: 12,659.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.28 : 18,479.04 = 8,457.28 : x
  2. Step 2: Convert to fraction form
    12,345.28/18,479.04 = 8,457.28/x
  3. Step 3: Cross multiply
    12,345.28x = 18,479.04 × 8,457.28
  4. Step 4: Simplify right side
    12,345.28x = 156,282,415.41
  5. Step 5: Solve for x
    x = 156,282,415.41/12,345.28
  6. Step 6: Final answer
    x = 12,659.28

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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.