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Finding the Fourth Proportional to 1,285.30, 1,928.00 and 505.23

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Solution

The fourth proportional to 1,285.30, 1,928.00 and 505.23 is: 757.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.30 : 1,928.00 = 505.23 : x
  2. Step 2: Convert to fraction form
    1,285.30/1,928.00 = 505.23/x
  3. Step 3: Cross multiply
    1,285.30x = 1,928.00 × 505.23
  4. Step 4: Simplify right side
    1,285.30x = 974,080.91
  5. Step 5: Solve for x
    x = 974,080.91/1,285.30
  6. Step 6: Final answer
    x = 757.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.