Home / 13,666.40-18,866.72-9,213.56

Finding the Fourth Proportional to 13,666.40, 18,866.72 and 9,213.56

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Solution

The fourth proportional to 13,666.40, 18,866.72 and 9,213.56 is: 12,719.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,666.40 : 18,866.72 = 9,213.56 : x
  2. Step 2: Convert to fraction form
    13,666.40/18,866.72 = 9,213.56/x
  3. Step 3: Cross multiply
    13,666.40x = 18,866.72 × 9,213.56
  4. Step 4: Simplify right side
    13,666.40x = 173,829,656.72
  5. Step 5: Solve for x
    x = 173,829,656.72/13,666.40
  6. Step 6: Final answer
    x = 12,719.49

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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.