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Finding the Fourth Proportional to 918.60, 1,376.10 and 853.80

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Solution

The fourth proportional to 918.60, 1,376.10 and 853.80 is: 1,279.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.60 : 1,376.10 = 853.80 : x
  2. Step 2: Convert to fraction form
    918.60/1,376.10 = 853.80/x
  3. Step 3: Cross multiply
    918.60x = 1,376.10 × 853.80
  4. Step 4: Simplify right side
    918.60x = 1,174,914.18
  5. Step 5: Solve for x
    x = 1,174,914.18/918.60
  6. Step 6: Final answer
    x = 1,279.03

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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.