Home / 28,405.16-39,199.40-15,658.80

Finding the Fourth Proportional to 28,405.16, 39,199.40 and 15,658.80

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Solution

The fourth proportional to 28,405.16, 39,199.40 and 15,658.80 is: 21,609.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.16 : 39,199.40 = 15,658.80 : x
  2. Step 2: Convert to fraction form
    28,405.16/39,199.40 = 15,658.80/x
  3. Step 3: Cross multiply
    28,405.16x = 39,199.40 × 15,658.80
  4. Step 4: Simplify right side
    28,405.16x = 613,815,564.72
  5. Step 5: Solve for x
    x = 613,815,564.72/28,405.16
  6. Step 6: Final answer
    x = 21,609.30

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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.