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Finding the Fourth Proportional to 21,988.80, 32,918.40 and 19,396.80

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Solution

The fourth proportional to 21,988.80, 32,918.40 and 19,396.80 is: 29,038.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.80 : 32,918.40 = 19,396.80 : x
  2. Step 2: Convert to fraction form
    21,988.80/32,918.40 = 19,396.80/x
  3. Step 3: Cross multiply
    21,988.80x = 32,918.40 × 19,396.80
  4. Step 4: Simplify right side
    21,988.80x = 638,511,621.12
  5. Step 5: Solve for x
    x = 638,511,621.12/21,988.80
  6. Step 6: Final answer
    x = 29,038.04

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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.