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Finding the Fourth Proportional to 1,153.64, 1,593.78 and 858.40

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Solution

The fourth proportional to 1,153.64, 1,593.78 and 858.40 is: 1,185.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.64 : 1,593.78 = 858.40 : x
  2. Step 2: Convert to fraction form
    1,153.64/1,593.78 = 858.40/x
  3. Step 3: Cross multiply
    1,153.64x = 1,593.78 × 858.40
  4. Step 4: Simplify right side
    1,153.64x = 1,368,093.55
  5. Step 5: Solve for x
    x = 1,368,093.55/1,153.64
  6. Step 6: Final answer
    x = 1,185.89

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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.