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Finding the Fourth Proportional to 1,311.09, 1,810.23 and 869.91

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Solution

The fourth proportional to 1,311.09, 1,810.23 and 869.91 is: 1,201.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.09 : 1,810.23 = 869.91 : x
  2. Step 2: Convert to fraction form
    1,311.09/1,810.23 = 869.91/x
  3. Step 3: Cross multiply
    1,311.09x = 1,810.23 × 869.91
  4. Step 4: Simplify right side
    1,311.09x = 1,574,737.18
  5. Step 5: Solve for x
    x = 1,574,737.18/1,311.09
  6. Step 6: Final answer
    x = 1,201.09

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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.