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Finding the Fourth Proportional to 816.56, 1,225.20 and 383.84

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Solution

The fourth proportional to 816.56, 1,225.20 and 383.84 is: 575.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.56 : 1,225.20 = 383.84 : x
  2. Step 2: Convert to fraction form
    816.56/1,225.20 = 383.84/x
  3. Step 3: Cross multiply
    816.56x = 1,225.20 × 383.84
  4. Step 4: Simplify right side
    816.56x = 470,280.77
  5. Step 5: Solve for x
    x = 470,280.77/816.56
  6. Step 6: Final answer
    x = 575.93

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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.