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Finding the Fourth Proportional to 879.06, 1,316.31 and 853.11

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Solution

The fourth proportional to 879.06, 1,316.31 and 853.11 is: 1,277.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.06 : 1,316.31 = 853.11 : x
  2. Step 2: Convert to fraction form
    879.06/1,316.31 = 853.11/x
  3. Step 3: Cross multiply
    879.06x = 1,316.31 × 853.11
  4. Step 4: Simplify right side
    879.06x = 1,122,957.22
  5. Step 5: Solve for x
    x = 1,122,957.22/879.06
  6. Step 6: Final answer
    x = 1,277.45

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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.