Home / 21,868.08-30,177.07-12,918.45

Finding the Fourth Proportional to 21,868.08, 30,177.07 and 12,918.45

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Solution

The fourth proportional to 21,868.08, 30,177.07 and 12,918.45 is: 17,826.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,868.08 : 30,177.07 = 12,918.45 : x
  2. Step 2: Convert to fraction form
    21,868.08/30,177.07 = 12,918.45/x
  3. Step 3: Cross multiply
    21,868.08x = 30,177.07 × 12,918.45
  4. Step 4: Simplify right side
    21,868.08x = 389,840,969.94
  5. Step 5: Solve for x
    x = 389,840,969.94/21,868.08
  6. Step 6: Final answer
    x = 17,826.94

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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.