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Finding the Fourth Proportional to 858.50, 1,183.77 and 621.98

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Solution

The fourth proportional to 858.50, 1,183.77 and 621.98 is: 857.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.50 : 1,183.77 = 621.98 : x
  2. Step 2: Convert to fraction form
    858.50/1,183.77 = 621.98/x
  3. Step 3: Cross multiply
    858.50x = 1,183.77 × 621.98
  4. Step 4: Simplify right side
    858.50x = 736,275.35
  5. Step 5: Solve for x
    x = 736,275.35/858.50
  6. Step 6: Final answer
    x = 857.63

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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.