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Finding the Fourth Proportional to 1,954.62, 2,931.99 and 858.42

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Solution

The fourth proportional to 1,954.62, 2,931.99 and 858.42 is: 1,287.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,954.62 : 2,931.99 = 858.42 : x
  2. Step 2: Convert to fraction form
    1,954.62/2,931.99 = 858.42/x
  3. Step 3: Cross multiply
    1,954.62x = 2,931.99 × 858.42
  4. Step 4: Simplify right side
    1,954.62x = 2,516,878.86
  5. Step 5: Solve for x
    x = 2,516,878.86/1,954.62
  6. Step 6: Final answer
    x = 1,287.66

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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.