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Finding the Fourth Proportional to 985.80, 1,478.40 and 369.48

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Solution

The fourth proportional to 985.80, 1,478.40 and 369.48 is: 554.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.80 : 1,478.40 = 369.48 : x
  2. Step 2: Convert to fraction form
    985.80/1,478.40 = 369.48/x
  3. Step 3: Cross multiply
    985.80x = 1,478.40 × 369.48
  4. Step 4: Simplify right side
    985.80x = 546,239.23
  5. Step 5: Solve for x
    x = 546,239.23/985.80
  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.