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Finding the Fourth Proportional to 1,147.67, 1,583.78 and 623.70

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Solution

The fourth proportional to 1,147.67, 1,583.78 and 623.70 is: 860.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.67 : 1,583.78 = 623.70 : x
  2. Step 2: Convert to fraction form
    1,147.67/1,583.78 = 623.70/x
  3. Step 3: Cross multiply
    1,147.67x = 1,583.78 × 623.70
  4. Step 4: Simplify right side
    1,147.67x = 987,808.75
  5. Step 5: Solve for x
    x = 987,808.75/1,147.67
  6. Step 6: Final answer
    x = 860.71

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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.