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Finding the Fourth Proportional to 896.70, 1,345.05 and 280.35

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Solution

The fourth proportional to 896.70, 1,345.05 and 280.35 is: 420.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    896.70 : 1,345.05 = 280.35 : x
  2. Step 2: Convert to fraction form
    896.70/1,345.05 = 280.35/x
  3. Step 3: Cross multiply
    896.70x = 1,345.05 × 280.35
  4. Step 4: Simplify right side
    896.70x = 377,084.77
  5. Step 5: Solve for x
    x = 377,084.77/896.70
  6. Step 6: Final answer
    x = 420.53

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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.