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Finding the Fourth Proportional to 14,490.40, 21,735.60 and 10,991.20

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Solution

The fourth proportional to 14,490.40, 21,735.60 and 10,991.20 is: 16,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,490.40 : 21,735.60 = 10,991.20 : x
  2. Step 2: Convert to fraction form
    14,490.40/21,735.60 = 10,991.20/x
  3. Step 3: Cross multiply
    14,490.40x = 21,735.60 × 10,991.20
  4. Step 4: Simplify right side
    14,490.40x = 238,900,326.72
  5. Step 5: Solve for x
    x = 238,900,326.72/14,490.40
  6. Step 6: Final answer
    x = 16,486.80

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1.5x scale

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.