Home / 12,455.28-18,686.53-3,690.40

Finding the Fourth Proportional to 12,455.28, 18,686.53 and 3,690.40

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Solution

The fourth proportional to 12,455.28, 18,686.53 and 3,690.40 is: 5,536.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,455.28 : 18,686.53 = 3,690.40 : x
  2. Step 2: Convert to fraction form
    12,455.28/18,686.53 = 3,690.40/x
  3. Step 3: Cross multiply
    12,455.28x = 18,686.53 × 3,690.40
  4. Step 4: Simplify right side
    12,455.28x = 68,960,770.31
  5. Step 5: Solve for x
    x = 68,960,770.31/12,455.28
  6. Step 6: Final answer
    x = 5,536.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.