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Finding the Fourth Proportional to 19,920.40, 29,880.60 and 17,731.60

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Solution

The fourth proportional to 19,920.40, 29,880.60 and 17,731.60 is: 26,597.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.40 : 29,880.60 = 17,731.60 : x
  2. Step 2: Convert to fraction form
    19,920.40/29,880.60 = 17,731.60/x
  3. Step 3: Cross multiply
    19,920.40x = 29,880.60 × 17,731.60
  4. Step 4: Simplify right side
    19,920.40x = 529,830,846.96
  5. Step 5: Solve for x
    x = 529,830,846.96/19,920.40
  6. Step 6: Final answer
    x = 26,597.40

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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.