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Finding the Fourth Proportional to 28,058.40, 42,136.20 and 19,796.40

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Solution

The fourth proportional to 28,058.40, 42,136.20 and 19,796.40 is: 29,728.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,058.40 : 42,136.20 = 19,796.40 : x
  2. Step 2: Convert to fraction form
    28,058.40/42,136.20 = 19,796.40/x
  3. Step 3: Cross multiply
    28,058.40x = 42,136.20 × 19,796.40
  4. Step 4: Simplify right side
    28,058.40x = 834,145,069.68
  5. Step 5: Solve for x
    x = 834,145,069.68/28,058.40
  6. Step 6: Final answer
    x = 29,728.89

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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.