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Finding the Fourth Proportional to 21,201, 29,260.08 and 12,817.50

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Solution

The fourth proportional to 21,201, 29,260.08 and 12,817.50 is: 17,689.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,201 : 29,260.08 = 12,817.50 : x
  2. Step 2: Convert to fraction form
    21,201/29,260.08 = 12,817.50/x
  3. Step 3: Cross multiply
    21,201x = 29,260.08 × 12,817.50
  4. Step 4: Simplify right side
    21,201x = 375,041,075.40
  5. Step 5: Solve for x
    x = 375,041,075.40/21,201
  6. Step 6: Final answer
    x = 17,689.78

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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.