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Finding the Fourth Proportional to 19,920.96, 29,800.80 and 16,640.64

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Solution

The fourth proportional to 19,920.96, 29,800.80 and 16,640.64 is: 24,893.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.96 : 29,800.80 = 16,640.64 : x
  2. Step 2: Convert to fraction form
    19,920.96/29,800.80 = 16,640.64/x
  3. Step 3: Cross multiply
    19,920.96x = 29,800.80 × 16,640.64
  4. Step 4: Simplify right side
    19,920.96x = 495,904,384.51
  5. Step 5: Solve for x
    x = 495,904,384.51/19,920.96
  6. Step 6: Final answer
    x = 24,893.60

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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.