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Finding the Fourth Proportional to 1,147.70, 1,583.80 and 623.72

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Solution

The fourth proportional to 1,147.70, 1,583.80 and 623.72 is: 860.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.70 : 1,583.80 = 623.72 : x
  2. Step 2: Convert to fraction form
    1,147.70/1,583.80 = 623.72/x
  3. Step 3: Cross multiply
    1,147.70x = 1,583.80 × 623.72
  4. Step 4: Simplify right side
    1,147.70x = 987,847.74
  5. Step 5: Solve for x
    x = 987,847.74/1,147.70
  6. Step 6: Final answer
    x = 860.72

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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.