Home / 13,890.69-19,168.07-7,921.98

Finding the Fourth Proportional to 13,890.69, 19,168.07 and 7,921.98

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Solution

The fourth proportional to 13,890.69, 19,168.07 and 7,921.98 is: 10,931.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.69 : 19,168.07 = 7,921.98 : x
  2. Step 2: Convert to fraction form
    13,890.69/19,168.07 = 7,921.98/x
  3. Step 3: Cross multiply
    13,890.69x = 19,168.07 × 7,921.98
  4. Step 4: Simplify right side
    13,890.69x = 151,849,027.57
  5. Step 5: Solve for x
    x = 151,849,027.57/13,890.69
  6. Step 6: Final answer
    x = 10,931.71

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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.