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Finding the Fourth Proportional to 1,442.42, 1,990.67 and 852.85

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Solution

The fourth proportional to 1,442.42, 1,990.67 and 852.85 is: 1,177.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.42 : 1,990.67 = 852.85 : x
  2. Step 2: Convert to fraction form
    1,442.42/1,990.67 = 852.85/x
  3. Step 3: Cross multiply
    1,442.42x = 1,990.67 × 852.85
  4. Step 4: Simplify right side
    1,442.42x = 1,697,740.06
  5. Step 5: Solve for x
    x = 1,697,740.06/1,442.42
  6. Step 6: Final answer
    x = 1,177.01

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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.