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Finding the Fourth Proportional to 19,776.40, 29,664.60 and 12,389.20

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Solution

The fourth proportional to 19,776.40, 29,664.60 and 12,389.20 is: 18,583.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,776.40 : 29,664.60 = 12,389.20 : x
  2. Step 2: Convert to fraction form
    19,776.40/29,664.60 = 12,389.20/x
  3. Step 3: Cross multiply
    19,776.40x = 29,664.60 × 12,389.20
  4. Step 4: Simplify right side
    19,776.40x = 367,520,662.32
  5. Step 5: Solve for x
    x = 367,520,662.32/19,776.40
  6. Step 6: Final answer
    x = 18,583.80

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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.