Home / 13,135.72-19,560.53-12,990.28

Finding the Fourth Proportional to 13,135.72, 19,560.53 and 12,990.28

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Solution

The fourth proportional to 13,135.72, 19,560.53 and 12,990.28 is: 19,343.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,135.72 : 19,560.53 = 12,990.28 : x
  2. Step 2: Convert to fraction form
    13,135.72/19,560.53 = 12,990.28/x
  3. Step 3: Cross multiply
    13,135.72x = 19,560.53 × 12,990.28
  4. Step 4: Simplify right side
    13,135.72x = 254,096,761.65
  5. Step 5: Solve for x
    x = 254,096,761.65/13,135.72
  6. Step 6: Final answer
    x = 19,343.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.