Home / 13,638.11-18,818.73-7,668.81

Finding the Fourth Proportional to 13,638.11, 18,818.73 and 7,668.81

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Solution

The fourth proportional to 13,638.11, 18,818.73 and 7,668.81 is: 10,581.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.11 : 18,818.73 = 7,668.81 : x
  2. Step 2: Convert to fraction form
    13,638.11/18,818.73 = 7,668.81/x
  3. Step 3: Cross multiply
    13,638.11x = 18,818.73 × 7,668.81
  4. Step 4: Simplify right side
    13,638.11x = 144,317,264.81
  5. Step 5: Solve for x
    x = 144,317,264.81/13,638.11
  6. Step 6: Final answer
    x = 10,581.91

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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.