Home / 13,369.98-18,431.34-9,378.72

Finding the Fourth Proportional to 13,369.98, 18,431.34 and 9,378.72

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Solution

The fourth proportional to 13,369.98, 18,431.34 and 9,378.72 is: 12,929.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,369.98 : 18,431.34 = 9,378.72 : x
  2. Step 2: Convert to fraction form
    13,369.98/18,431.34 = 9,378.72/x
  3. Step 3: Cross multiply
    13,369.98x = 18,431.34 × 9,378.72
  4. Step 4: Simplify right side
    13,369.98x = 172,862,377.08
  5. Step 5: Solve for x
    x = 172,862,377.08/13,369.98
  6. Step 6: Final answer
    x = 12,929.14

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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.