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Finding the Fourth Proportional to 1,586.58, 2,379.75 and 612.60

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Solution

The fourth proportional to 1,586.58, 2,379.75 and 612.60 is: 918.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.58 : 2,379.75 = 612.60 : x
  2. Step 2: Convert to fraction form
    1,586.58/2,379.75 = 612.60/x
  3. Step 3: Cross multiply
    1,586.58x = 2,379.75 × 612.60
  4. Step 4: Simplify right side
    1,586.58x = 1,457,834.85
  5. Step 5: Solve for x
    x = 1,457,834.85/1,586.58
  6. Step 6: Final answer
    x = 918.85

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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.