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Finding the Fourth Proportional to 858.32, 1,185.40 and 694.32

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Solution

The fourth proportional to 858.32, 1,185.40 and 694.32 is: 958.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.32 : 1,185.40 = 694.32 : x
  2. Step 2: Convert to fraction form
    858.32/1,185.40 = 694.32/x
  3. Step 3: Cross multiply
    858.32x = 1,185.40 × 694.32
  4. Step 4: Simplify right side
    858.32x = 823,046.93
  5. Step 5: Solve for x
    x = 823,046.93/858.32
  6. Step 6: Final answer
    x = 958.90

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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.