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Finding the Fourth Proportional to 1,316.58, 1,817.34 and 874.60

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Solution

The fourth proportional to 1,316.58, 1,817.34 and 874.60 is: 1,207.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.58 : 1,817.34 = 874.60 : x
  2. Step 2: Convert to fraction form
    1,316.58/1,817.34 = 874.60/x
  3. Step 3: Cross multiply
    1,316.58x = 1,817.34 × 874.60
  4. Step 4: Simplify right side
    1,316.58x = 1,589,445.56
  5. Step 5: Solve for x
    x = 1,589,445.56/1,316.58
  6. Step 6: Final answer
    x = 1,207.25

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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.