Home / 20,870.55-28,800.40-11,438.91

Finding the Fourth Proportional to 20,870.55, 28,800.40 and 11,438.91

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Solution

The fourth proportional to 20,870.55, 28,800.40 and 11,438.91 is: 15,785.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.55 : 28,800.40 = 11,438.91 : x
  2. Step 2: Convert to fraction form
    20,870.55/28,800.40 = 11,438.91/x
  3. Step 3: Cross multiply
    20,870.55x = 28,800.40 × 11,438.91
  4. Step 4: Simplify right side
    20,870.55x = 329,445,183.56
  5. Step 5: Solve for x
    x = 329,445,183.56/20,870.55
  6. Step 6: Final answer
    x = 15,785.17

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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.