Home / 28,102.55-38,781.05-15,355.45

Finding the Fourth Proportional to 28,102.55, 38,781.05 and 15,355.45

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Solution

The fourth proportional to 28,102.55, 38,781.05 and 15,355.45 is: 21,190.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,102.55 : 38,781.05 = 15,355.45 : x
  2. Step 2: Convert to fraction form
    28,102.55/38,781.05 = 15,355.45/x
  3. Step 3: Cross multiply
    28,102.55x = 38,781.05 × 15,355.45
  4. Step 4: Simplify right side
    28,102.55x = 595,500,474.22
  5. Step 5: Solve for x
    x = 595,500,474.22/28,102.55
  6. Step 6: Final answer
    x = 21,190.26

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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.