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Finding the Fourth Proportional to 1,442.99, 1,991.30 and 853.67

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Solution

The fourth proportional to 1,442.99, 1,991.30 and 853.67 is: 1,178.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.99 : 1,991.30 = 853.67 : x
  2. Step 2: Convert to fraction form
    1,442.99/1,991.30 = 853.67/x
  3. Step 3: Cross multiply
    1,442.99x = 1,991.30 × 853.67
  4. Step 4: Simplify right side
    1,442.99x = 1,699,898.85
  5. Step 5: Solve for x
    x = 1,699,898.85/1,442.99
  6. Step 6: Final answer
    x = 1,178.04

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1.5x scale

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.