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Finding the Fourth Proportional to 985.48, 1,478.77 and 369.61

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Solution

The fourth proportional to 985.48, 1,478.77 and 369.61 is: 554.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.48 : 1,478.77 = 369.61 : x
  2. Step 2: Convert to fraction form
    985.48/1,478.77 = 369.61/x
  3. Step 3: Cross multiply
    985.48x = 1,478.77 × 369.61
  4. Step 4: Simplify right side
    985.48x = 546,563.56
  5. Step 5: Solve for x
    x = 546,563.56/985.48
  6. Step 6: Final answer
    x = 554.62

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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.