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Finding the Fourth Proportional to 3,860.16, 5,790.24 and 938.45

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Solution

The fourth proportional to 3,860.16, 5,790.24 and 938.45 is: 1,407.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,860.16 : 5,790.24 = 938.45 : x
  2. Step 2: Convert to fraction form
    3,860.16/5,790.24 = 938.45/x
  3. Step 3: Cross multiply
    3,860.16x = 5,790.24 × 938.45
  4. Step 4: Simplify right side
    3,860.16x = 5,433,821.78
  5. Step 5: Solve for x
    x = 5,433,821.78/3,860.16
  6. Step 6: Final answer
    x = 1,407.67

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1.5x scale

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.