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Finding the Fourth Proportional to 2,318.94, 3,478.32 and 858.38

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Solution

The fourth proportional to 2,318.94, 3,478.32 and 858.38 is: 1,287.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,318.94 : 3,478.32 = 858.38 : x
  2. Step 2: Convert to fraction form
    2,318.94/3,478.32 = 858.38/x
  3. Step 3: Cross multiply
    2,318.94x = 3,478.32 × 858.38
  4. Step 4: Simplify right side
    2,318.94x = 2,985,702.93
  5. Step 5: Solve for x
    x = 2,985,702.93/2,318.94
  6. Step 6: Final answer
    x = 1,287.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.