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Finding the Fourth Proportional to 985.14, 1,478.25 and 369.27

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Solution

The fourth proportional to 985.14, 1,478.25 and 369.27 is: 554.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.14 : 1,478.25 = 369.27 : x
  2. Step 2: Convert to fraction form
    985.14/1,478.25 = 369.27/x
  3. Step 3: Cross multiply
    985.14x = 1,478.25 × 369.27
  4. Step 4: Simplify right side
    985.14x = 545,873.38
  5. Step 5: Solve for x
    x = 545,873.38/985.14
  6. Step 6: Final answer
    x = 554.11

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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.