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Finding the Fourth Proportional to 21,878.20, 32,768.70 and 18,962.20

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Solution

The fourth proportional to 21,878.20, 32,768.70 and 18,962.20 is: 28,401.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878.20 : 32,768.70 = 18,962.20 : x
  2. Step 2: Convert to fraction form
    21,878.20/32,768.70 = 18,962.20/x
  3. Step 3: Cross multiply
    21,878.20x = 32,768.70 × 18,962.20
  4. Step 4: Simplify right side
    21,878.20x = 621,366,643.14
  5. Step 5: Solve for x
    x = 621,366,643.14/21,878.20
  6. Step 6: Final answer
    x = 28,401.18

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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.