Home / 13,121.10-19,681.65-12,408.30

Finding the Fourth Proportional to 13,121.10, 19,681.65 and 12,408.30

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Solution

The fourth proportional to 13,121.10, 19,681.65 and 12,408.30 is: 18,612.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.10 : 19,681.65 = 12,408.30 : x
  2. Step 2: Convert to fraction form
    13,121.10/19,681.65 = 12,408.30/x
  3. Step 3: Cross multiply
    13,121.10x = 19,681.65 × 12,408.30
  4. Step 4: Simplify right side
    13,121.10x = 244,215,817.70
  5. Step 5: Solve for x
    x = 244,215,817.70/13,121.10
  6. Step 6: Final answer
    x = 18,612.45

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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.