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Finding the Fourth Proportional to 1,461.10, 2,189.64 and 640.06

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Solution

The fourth proportional to 1,461.10, 2,189.64 and 640.06 is: 959.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,461.10 : 2,189.64 = 640.06 : x
  2. Step 2: Convert to fraction form
    1,461.10/2,189.64 = 640.06/x
  3. Step 3: Cross multiply
    1,461.10x = 2,189.64 × 640.06
  4. Step 4: Simplify right side
    1,461.10x = 1,401,500.98
  5. Step 5: Solve for x
    x = 1,401,500.98/1,461.10
  6. Step 6: Final answer
    x = 959.21

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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.