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Finding the Fourth Proportional to 985.86, 1,478.39 and 369.25

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Solution

The fourth proportional to 985.86, 1,478.39 and 369.25 is: 553.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.86 : 1,478.39 = 369.25 : x
  2. Step 2: Convert to fraction form
    985.86/1,478.39 = 369.25/x
  3. Step 3: Cross multiply
    985.86x = 1,478.39 × 369.25
  4. Step 4: Simplify right side
    985.86x = 545,895.68
  5. Step 5: Solve for x
    x = 545,895.68/985.86
  6. Step 6: Final answer
    x = 553.72

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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.