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Finding the Fourth Proportional to 19,978.40, 27,569.39 and 11,025.79

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Solution

The fourth proportional to 19,978.40, 27,569.39 and 11,025.79 is: 15,215.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,978.40 : 27,569.39 = 11,025.79 : x
  2. Step 2: Convert to fraction form
    19,978.40/27,569.39 = 11,025.79/x
  3. Step 3: Cross multiply
    19,978.40x = 27,569.39 × 11,025.79
  4. Step 4: Simplify right side
    19,978.40x = 303,974,211.53
  5. Step 5: Solve for x
    x = 303,974,211.53/19,978.40
  6. Step 6: Final answer
    x = 15,215.14

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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.