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Finding the Fourth Proportional to 1,674.68, 2,311.10 and 928.70

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Solution

The fourth proportional to 1,674.68, 2,311.10 and 928.70 is: 1,281.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,674.68 : 2,311.10 = 928.70 : x
  2. Step 2: Convert to fraction form
    1,674.68/2,311.10 = 928.70/x
  3. Step 3: Cross multiply
    1,674.68x = 2,311.10 × 928.70
  4. Step 4: Simplify right side
    1,674.68x = 2,146,302.37
  5. Step 5: Solve for x
    x = 2,146,302.37/1,674.68
  6. Step 6: Final answer
    x = 1,281.62

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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.