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Finding the Fourth Proportional to 1,318.06, 1,818.73 and 786.82

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Solution

The fourth proportional to 1,318.06, 1,818.73 and 786.82 is: 1,085.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.06 : 1,818.73 = 786.82 : x
  2. Step 2: Convert to fraction form
    1,318.06/1,818.73 = 786.82/x
  3. Step 3: Cross multiply
    1,318.06x = 1,818.73 × 786.82
  4. Step 4: Simplify right side
    1,318.06x = 1,431,013.14
  5. Step 5: Solve for x
    x = 1,431,013.14/1,318.06
  6. Step 6: Final answer
    x = 1,085.70

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1.5x scale

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.