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Finding the Fourth Proportional to 19,920.20, 29,880.30 and 13,699.40

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Solution

The fourth proportional to 19,920.20, 29,880.30 and 13,699.40 is: 20,549.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.20 : 29,880.30 = 13,699.40 : x
  2. Step 2: Convert to fraction form
    19,920.20/29,880.30 = 13,699.40/x
  3. Step 3: Cross multiply
    19,920.20x = 29,880.30 × 13,699.40
  4. Step 4: Simplify right side
    19,920.20x = 409,342,181.82
  5. Step 5: Solve for x
    x = 409,342,181.82/19,920.20
  6. Step 6: Final answer
    x = 20,549.10

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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.