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Finding the Fourth Proportional to 985.70, 1,478.54 and 336.44

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Solution

The fourth proportional to 985.70, 1,478.54 and 336.44 is: 504.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.70 : 1,478.54 = 336.44 : x
  2. Step 2: Convert to fraction form
    985.70/1,478.54 = 336.44/x
  3. Step 3: Cross multiply
    985.70x = 1,478.54 × 336.44
  4. Step 4: Simplify right side
    985.70x = 497,440.00
  5. Step 5: Solve for x
    x = 497,440.00/985.70
  6. Step 6: Final answer
    x = 504.66

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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.