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Finding the Fourth Proportional to 1,311.77, 1,810.56 and 752.57

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Solution

The fourth proportional to 1,311.77, 1,810.56 and 752.57 is: 1,038.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.77 : 1,810.56 = 752.57 : x
  2. Step 2: Convert to fraction form
    1,311.77/1,810.56 = 752.57/x
  3. Step 3: Cross multiply
    1,311.77x = 1,810.56 × 752.57
  4. Step 4: Simplify right side
    1,311.77x = 1,362,573.14
  5. Step 5: Solve for x
    x = 1,362,573.14/1,311.77
  6. Step 6: Final answer
    x = 1,038.73

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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.