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Finding the Fourth Proportional to 985.96, 1,478.78 and 369.64

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Solution

The fourth proportional to 985.96, 1,478.78 and 369.64 is: 554.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.96 : 1,478.78 = 369.64 : x
  2. Step 2: Convert to fraction form
    985.96/1,478.78 = 369.64/x
  3. Step 3: Cross multiply
    985.96x = 1,478.78 × 369.64
  4. Step 4: Simplify right side
    985.96x = 546,616.24
  5. Step 5: Solve for x
    x = 546,616.24/985.96
  6. Step 6: Final answer
    x = 554.40

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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.