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Finding the Fourth Proportional to 19,781.98, 29,673.03 and 4,990.90

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Solution

The fourth proportional to 19,781.98, 29,673.03 and 4,990.90 is: 7,486.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,781.98 : 29,673.03 = 4,990.90 : x
  2. Step 2: Convert to fraction form
    19,781.98/29,673.03 = 4,990.90/x
  3. Step 3: Cross multiply
    19,781.98x = 29,673.03 × 4,990.90
  4. Step 4: Simplify right side
    19,781.98x = 148,095,180.15
  5. Step 5: Solve for x
    x = 148,095,180.15/19,781.98
  6. Step 6: Final answer
    x = 7,486.37

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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.