Home / 20,870.14-28,800.48-11,438.71

Finding the Fourth Proportional to 20,870.14, 28,800.48 and 11,438.71

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Solution

The fourth proportional to 20,870.14, 28,800.48 and 11,438.71 is: 15,785.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.14 : 28,800.48 = 11,438.71 : x
  2. Step 2: Convert to fraction form
    20,870.14/28,800.48 = 11,438.71/x
  3. Step 3: Cross multiply
    20,870.14x = 28,800.48 × 11,438.71
  4. Step 4: Simplify right side
    20,870.14x = 329,440,338.58
  5. Step 5: Solve for x
    x = 329,440,338.58/20,870.14
  6. Step 6: Final answer
    x = 15,785.25

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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.