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Finding the Fourth Proportional to 1,605, 2,214.90 and 869

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Solution

The fourth proportional to 1,605, 2,214.90 and 869 is: 1,199.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605 : 2,214.90 = 869 : x
  2. Step 2: Convert to fraction form
    1,605/2,214.90 = 869/x
  3. Step 3: Cross multiply
    1,605x = 2,214.90 × 869
  4. Step 4: Simplify right side
    1,605x = 1,924,748.10
  5. Step 5: Solve for x
    x = 1,924,748.10/1,605
  6. Step 6: Final answer
    x = 1,199.22

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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.