Home / 20,689.04-28,551-11,257.67

Finding the Fourth Proportional to 20,689.04, 28,551 and 11,257.67

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Solution

The fourth proportional to 20,689.04, 28,551 and 11,257.67 is: 15,535.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.04 : 28,551 = 11,257.67 : x
  2. Step 2: Convert to fraction form
    20,689.04/28,551 = 11,257.67/x
  3. Step 3: Cross multiply
    20,689.04x = 28,551 × 11,257.67
  4. Step 4: Simplify right side
    20,689.04x = 321,417,593.42
  5. Step 5: Solve for x
    x = 321,417,593.42/20,689.04
  6. Step 6: Final answer
    x = 15,535.65

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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.