Home / 28,390.92-39,178.68-15,644.16

Finding the Fourth Proportional to 28,390.92, 39,178.68 and 15,644.16

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Solution

The fourth proportional to 28,390.92, 39,178.68 and 15,644.16 is: 21,588.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,390.92 : 39,178.68 = 15,644.16 : x
  2. Step 2: Convert to fraction form
    28,390.92/39,178.68 = 15,644.16/x
  3. Step 3: Cross multiply
    28,390.92x = 39,178.68 × 15,644.16
  4. Step 4: Simplify right side
    28,390.92x = 612,917,538.51
  5. Step 5: Solve for x
    x = 612,917,538.51/28,390.92
  6. Step 6: Final answer
    x = 21,588.51

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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.