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Finding the Fourth Proportional to 1,435.18, 1,980.80 and 845.74

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Solution

The fourth proportional to 1,435.18, 1,980.80 and 845.74 is: 1,167.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.18 : 1,980.80 = 845.74 : x
  2. Step 2: Convert to fraction form
    1,435.18/1,980.80 = 845.74/x
  3. Step 3: Cross multiply
    1,435.18x = 1,980.80 × 845.74
  4. Step 4: Simplify right side
    1,435.18x = 1,675,241.79
  5. Step 5: Solve for x
    x = 1,675,241.79/1,435.18
  6. Step 6: Final answer
    x = 1,167.27

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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.