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Finding the Fourth Proportional to 985.95, 1,478.46 and 369.64

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Solution

The fourth proportional to 985.95, 1,478.46 and 369.64 is: 554.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.95 : 1,478.46 = 369.64 : x
  2. Step 2: Convert to fraction form
    985.95/1,478.46 = 369.64/x
  3. Step 3: Cross multiply
    985.95x = 1,478.46 × 369.64
  4. Step 4: Simplify right side
    985.95x = 546,497.95
  5. Step 5: Solve for x
    x = 546,497.95/985.95
  6. Step 6: Final answer
    x = 554.29

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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.