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Finding the Fourth Proportional to 19,361.40, 28,998.90 and 18,929.40

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Solution

The fourth proportional to 19,361.40, 28,998.90 and 18,929.40 is: 28,351.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,361.40 : 28,998.90 = 18,929.40 : x
  2. Step 2: Convert to fraction form
    19,361.40/28,998.90 = 18,929.40/x
  3. Step 3: Cross multiply
    19,361.40x = 28,998.90 × 18,929.40
  4. Step 4: Simplify right side
    19,361.40x = 548,931,777.66
  5. Step 5: Solve for x
    x = 548,931,777.66/19,361.40
  6. Step 6: Final answer
    x = 28,351.86

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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.