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Finding the Fourth Proportional to 19,409.80, 29,114.70 and 11,115.40

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Solution

The fourth proportional to 19,409.80, 29,114.70 and 11,115.40 is: 16,673.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,409.80 : 29,114.70 = 11,115.40 : x
  2. Step 2: Convert to fraction form
    19,409.80/29,114.70 = 11,115.40/x
  3. Step 3: Cross multiply
    19,409.80x = 29,114.70 × 11,115.40
  4. Step 4: Simplify right side
    19,409.80x = 323,621,536.38
  5. Step 5: Solve for x
    x = 323,621,536.38/19,409.80
  6. Step 6: Final answer
    x = 16,673.10

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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.