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Finding the Fourth Proportional to 13,312.40, 19,930.20 and 8,128.40

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Solution

The fourth proportional to 13,312.40, 19,930.20 and 8,128.40 is: 12,169.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,312.40 : 19,930.20 = 8,128.40 : x
  2. Step 2: Convert to fraction form
    13,312.40/19,930.20 = 8,128.40/x
  3. Step 3: Cross multiply
    13,312.40x = 19,930.20 × 8,128.40
  4. Step 4: Simplify right side
    13,312.40x = 162,000,637.68
  5. Step 5: Solve for x
    x = 162,000,637.68/13,312.40
  6. Step 6: Final answer
    x = 12,169.15

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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.