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Finding the Fourth Proportional to 1,674.86, 2,311.16 and 928.80

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Solution

The fourth proportional to 1,674.86, 2,311.16 and 928.80 is: 1,281.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,674.86 : 2,311.16 = 928.80 : x
  2. Step 2: Convert to fraction form
    1,674.86/2,311.16 = 928.80/x
  3. Step 3: Cross multiply
    1,674.86x = 2,311.16 × 928.80
  4. Step 4: Simplify right side
    1,674.86x = 2,146,600.76
  5. Step 5: Solve for x
    x = 2,146,600.76/1,674.86
  6. Step 6: Final answer
    x = 1,281.66

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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.