Home / 13,515.40-18,656.94-8,211.91

Finding the Fourth Proportional to 13,515.40, 18,656.94 and 8,211.91

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Solution

The fourth proportional to 13,515.40, 18,656.94 and 8,211.91 is: 11,335.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,515.40 : 18,656.94 = 8,211.91 : x
  2. Step 2: Convert to fraction form
    13,515.40/18,656.94 = 8,211.91/x
  3. Step 3: Cross multiply
    13,515.40x = 18,656.94 × 8,211.91
  4. Step 4: Simplify right side
    13,515.40x = 153,209,112.16
  5. Step 5: Solve for x
    x = 153,209,112.16/13,515.40
  6. Step 6: Final answer
    x = 11,335.89

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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.