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Finding the Fourth Proportional to 1,211.61, 1,672.06 and 858.16

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Solution

The fourth proportional to 1,211.61, 1,672.06 and 858.16 is: 1,184.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.61 : 1,672.06 = 858.16 : x
  2. Step 2: Convert to fraction form
    1,211.61/1,672.06 = 858.16/x
  3. Step 3: Cross multiply
    1,211.61x = 1,672.06 × 858.16
  4. Step 4: Simplify right side
    1,211.61x = 1,434,895.01
  5. Step 5: Solve for x
    x = 1,434,895.01/1,211.61
  6. Step 6: Final answer
    x = 1,184.29

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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.