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Finding the Fourth Proportional to 1,674.89, 2,311.35 and 928.90

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Solution

The fourth proportional to 1,674.89, 2,311.35 and 928.90 is: 1,281.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,674.89 : 2,311.35 = 928.90 : x
  2. Step 2: Convert to fraction form
    1,674.89/2,311.35 = 928.90/x
  3. Step 3: Cross multiply
    1,674.89x = 2,311.35 × 928.90
  4. Step 4: Simplify right side
    1,674.89x = 2,147,013.02
  5. Step 5: Solve for x
    x = 2,147,013.02/1,674.89
  6. Step 6: Final answer
    x = 1,281.88

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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.