Home / 13,381.98-18,447.90-9,390.72

Finding the Fourth Proportional to 13,381.98, 18,447.90 and 9,390.72

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Solution

The fourth proportional to 13,381.98, 18,447.90 and 9,390.72 is: 12,945.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,381.98 : 18,447.90 = 9,390.72 : x
  2. Step 2: Convert to fraction form
    13,381.98/18,447.90 = 9,390.72/x
  3. Step 3: Cross multiply
    13,381.98x = 18,447.90 × 9,390.72
  4. Step 4: Simplify right side
    13,381.98x = 173,239,063.49
  5. Step 5: Solve for x
    x = 173,239,063.49/13,381.98
  6. Step 6: Final answer
    x = 12,945.70

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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.