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Finding the Fourth Proportional to 1,317.37, 1,818.07 and 820.03

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Solution

The fourth proportional to 1,317.37, 1,818.07 and 820.03 is: 1,131.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.37 : 1,818.07 = 820.03 : x
  2. Step 2: Convert to fraction form
    1,317.37/1,818.07 = 820.03/x
  3. Step 3: Cross multiply
    1,317.37x = 1,818.07 × 820.03
  4. Step 4: Simplify right side
    1,317.37x = 1,490,871.94
  5. Step 5: Solve for x
    x = 1,490,871.94/1,317.37
  6. Step 6: Final answer
    x = 1,131.70

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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.