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Finding the Fourth Proportional to 1,474.59, 2,211.16 and 858.45

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Solution

The fourth proportional to 1,474.59, 2,211.16 and 858.45 is: 1,287.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,474.59 : 2,211.16 = 858.45 : x
  2. Step 2: Convert to fraction form
    1,474.59/2,211.16 = 858.45/x
  3. Step 3: Cross multiply
    1,474.59x = 2,211.16 × 858.45
  4. Step 4: Simplify right side
    1,474.59x = 1,898,170.30
  5. Step 5: Solve for x
    x = 1,898,170.30/1,474.59
  6. Step 6: Final answer
    x = 1,287.25

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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.