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Finding the Fourth Proportional to 985.23, 1,477.81 and 368.96

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Solution

The fourth proportional to 985.23, 1,477.81 and 368.96 is: 553.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.23 : 1,477.81 = 368.96 : x
  2. Step 2: Convert to fraction form
    985.23/1,477.81 = 368.96/x
  3. Step 3: Cross multiply
    985.23x = 1,477.81 × 368.96
  4. Step 4: Simplify right side
    985.23x = 545,245.85
  5. Step 5: Solve for x
    x = 545,245.85/985.23
  6. Step 6: Final answer
    x = 553.42

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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.