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Finding the Fourth Proportional to 19,489.80, 29,239.50 and 5,640.20

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Solution

The fourth proportional to 19,489.80, 29,239.50 and 5,640.20 is: 8,461.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,489.80 : 29,239.50 = 5,640.20 : x
  2. Step 2: Convert to fraction form
    19,489.80/29,239.50 = 5,640.20/x
  3. Step 3: Cross multiply
    19,489.80x = 29,239.50 × 5,640.20
  4. Step 4: Simplify right side
    19,489.80x = 164,916,627.90
  5. Step 5: Solve for x
    x = 164,916,627.90/19,489.80
  6. Step 6: Final answer
    x = 8,461.69

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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.