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Finding the Fourth Proportional to 1,442.70, 1,990.90 and 853.43

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Solution

The fourth proportional to 1,442.70, 1,990.90 and 853.43 is: 1,177.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.70 : 1,990.90 = 853.43 : x
  2. Step 2: Convert to fraction form
    1,442.70/1,990.90 = 853.43/x
  3. Step 3: Cross multiply
    1,442.70x = 1,990.90 × 853.43
  4. Step 4: Simplify right side
    1,442.70x = 1,699,080.10
  5. Step 5: Solve for x
    x = 1,699,080.10/1,442.70
  6. Step 6: Final answer
    x = 1,177.71

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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.