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Finding the Fourth Proportional to 21,804.40, 30,089.16 and 11,868.40

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Solution

The fourth proportional to 21,804.40, 30,089.16 and 11,868.40 is: 16,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,804.40 : 30,089.16 = 11,868.40 : x
  2. Step 2: Convert to fraction form
    21,804.40/30,089.16 = 11,868.40/x
  3. Step 3: Cross multiply
    21,804.40x = 30,089.16 × 11,868.40
  4. Step 4: Simplify right side
    21,804.40x = 357,110,186.54
  5. Step 5: Solve for x
    x = 357,110,186.54/21,804.40
  6. Step 6: Final answer
    x = 16,377.90

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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.