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Finding the Fourth Proportional to 19,987.75, 29,981.63 and 6,136.75

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Solution

The fourth proportional to 19,987.75, 29,981.63 and 6,136.75 is: 9,205.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,987.75 : 29,981.63 = 6,136.75 : x
  2. Step 2: Convert to fraction form
    19,987.75/29,981.63 = 6,136.75/x
  3. Step 3: Cross multiply
    19,987.75x = 29,981.63 × 6,136.75
  4. Step 4: Simplify right side
    19,987.75x = 183,989,767.90
  5. Step 5: Solve for x
    x = 183,989,767.90/19,987.75
  6. Step 6: Final answer
    x = 9,205.13

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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.