Home / 20,688.89-28,517.47-13,972.37

Finding the Fourth Proportional to 20,688.89, 28,517.47 and 13,972.37

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Solution

The fourth proportional to 20,688.89, 28,517.47 and 13,972.37 is: 19,259.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.89 : 28,517.47 = 13,972.37 : x
  2. Step 2: Convert to fraction form
    20,688.89/28,517.47 = 13,972.37/x
  3. Step 3: Cross multiply
    20,688.89x = 28,517.47 × 13,972.37
  4. Step 4: Simplify right side
    20,688.89x = 398,456,464.79
  5. Step 5: Solve for x
    x = 398,456,464.79/20,688.89
  6. Step 6: Final answer
    x = 19,259.45

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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.