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Finding the Fourth Proportional to 1,586.77, 2,378.75 and 612.20

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Solution

The fourth proportional to 1,586.77, 2,378.75 and 612.20 is: 917.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.77 : 2,378.75 = 612.20 : x
  2. Step 2: Convert to fraction form
    1,586.77/2,378.75 = 612.20/x
  3. Step 3: Cross multiply
    1,586.77x = 2,378.75 × 612.20
  4. Step 4: Simplify right side
    1,586.77x = 1,456,270.75
  5. Step 5: Solve for x
    x = 1,456,270.75/1,586.77
  6. Step 6: Final answer
    x = 917.76

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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.