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Finding the Fourth Proportional to 39,391.70, 54,361.56 and 21,487

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Solution

The fourth proportional to 39,391.70, 54,361.56 and 21,487 is: 29,652.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,391.70 : 54,361.56 = 21,487 : x
  2. Step 2: Convert to fraction form
    39,391.70/54,361.56 = 21,487/x
  3. Step 3: Cross multiply
    39,391.70x = 54,361.56 × 21,487
  4. Step 4: Simplify right side
    39,391.70x = 1,168,066,839.72
  5. Step 5: Solve for x
    x = 1,168,066,839.72/39,391.70
  6. Step 6: Final answer
    x = 29,652.61

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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.