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Finding the Fourth Proportional to 21,075.61, 29,075.21 and 12,687.25

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Solution

The fourth proportional to 21,075.61, 29,075.21 and 12,687.25 is: 17,502.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,075.61 : 29,075.21 = 12,687.25 : x
  2. Step 2: Convert to fraction form
    21,075.61/29,075.21 = 12,687.25/x
  3. Step 3: Cross multiply
    21,075.61x = 29,075.21 × 12,687.25
  4. Step 4: Simplify right side
    21,075.61x = 368,884,394.64
  5. Step 5: Solve for x
    x = 368,884,394.64/21,075.61
  6. Step 6: Final answer
    x = 17,502.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.