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Finding the Fourth Proportional to 19,901.60, 29,848.80 and 12,492.80

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Solution

The fourth proportional to 19,901.60, 29,848.80 and 12,492.80 is: 18,736.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,901.60 : 29,848.80 = 12,492.80 : x
  2. Step 2: Convert to fraction form
    19,901.60/29,848.80 = 12,492.80/x
  3. Step 3: Cross multiply
    19,901.60x = 29,848.80 × 12,492.80
  4. Step 4: Simplify right side
    19,901.60x = 372,895,088.64
  5. Step 5: Solve for x
    x = 372,895,088.64/19,901.60
  6. Step 6: Final answer
    x = 18,736.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.