Home / 13,136.64-18,128.55-8,420.91

Finding the Fourth Proportional to 13,136.64, 18,128.55 and 8,420.91

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Solution

The fourth proportional to 13,136.64, 18,128.55 and 8,420.91 is: 11,620.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.64 : 18,128.55 = 8,420.91 : x
  2. Step 2: Convert to fraction form
    13,136.64/18,128.55 = 8,420.91/x
  3. Step 3: Cross multiply
    13,136.64x = 18,128.55 × 8,420.91
  4. Step 4: Simplify right side
    13,136.64x = 152,658,887.98
  5. Step 5: Solve for x
    x = 152,658,887.98/13,136.64
  6. Step 6: Final answer
    x = 11,620.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.