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Finding the Fourth Proportional to 985.70, 1,478.09 and 369.39

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Solution

The fourth proportional to 985.70, 1,478.09 and 369.39 is: 553.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.70 : 1,478.09 = 369.39 : x
  2. Step 2: Convert to fraction form
    985.70/1,478.09 = 369.39/x
  3. Step 3: Cross multiply
    985.70x = 1,478.09 × 369.39
  4. Step 4: Simplify right side
    985.70x = 545,989.82
  5. Step 5: Solve for x
    x = 545,989.82/985.70
  6. Step 6: Final answer
    x = 553.91

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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.