Home / 20,870.79-28,829.30-15,556.38

Finding the Fourth Proportional to 20,870.79, 28,829.30 and 15,556.38

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Solution

The fourth proportional to 20,870.79, 28,829.30 and 15,556.38 is: 21,488.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.79 : 28,829.30 = 15,556.38 : x
  2. Step 2: Convert to fraction form
    20,870.79/28,829.30 = 15,556.38/x
  3. Step 3: Cross multiply
    20,870.79x = 28,829.30 × 15,556.38
  4. Step 4: Simplify right side
    20,870.79x = 448,479,468.15
  5. Step 5: Solve for x
    x = 448,479,468.15/20,870.79
  6. Step 6: Final answer
    x = 21,488.38

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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.