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Finding the Fourth Proportional to 21,840.88, 30,140.40 and 11,904.88

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Solution

The fourth proportional to 21,840.88, 30,140.40 and 11,904.88 is: 16,428.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.88 : 30,140.40 = 11,904.88 : x
  2. Step 2: Convert to fraction form
    21,840.88/30,140.40 = 11,904.88/x
  3. Step 3: Cross multiply
    21,840.88x = 30,140.40 × 11,904.88
  4. Step 4: Simplify right side
    21,840.88x = 358,817,845.15
  5. Step 5: Solve for x
    x = 358,817,845.15/21,840.88
  6. Step 6: Final answer
    x = 16,428.73

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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.