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Finding the Fourth Proportional to 1,315.35, 1,971.70 and 853.43

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Solution

The fourth proportional to 1,315.35, 1,971.70 and 853.43 is: 1,279.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.35 : 1,971.70 = 853.43 : x
  2. Step 2: Convert to fraction form
    1,315.35/1,971.70 = 853.43/x
  3. Step 3: Cross multiply
    1,315.35x = 1,971.70 × 853.43
  4. Step 4: Simplify right side
    1,315.35x = 1,682,693.81
  5. Step 5: Solve for x
    x = 1,682,693.81/1,315.35
  6. Step 6: Final answer
    x = 1,279.27

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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.