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Finding the Fourth Proportional to 1,089.84, 1,635.16 and 858.98

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Solution

The fourth proportional to 1,089.84, 1,635.16 and 858.98 is: 1,288.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.84 : 1,635.16 = 858.98 : x
  2. Step 2: Convert to fraction form
    1,089.84/1,635.16 = 858.98/x
  3. Step 3: Cross multiply
    1,089.84x = 1,635.16 × 858.98
  4. Step 4: Simplify right side
    1,089.84x = 1,404,569.74
  5. Step 5: Solve for x
    x = 1,404,569.74/1,089.84
  6. Step 6: Final answer
    x = 1,288.79

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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.