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Finding the Fourth Proportional to 985.61, 1,478.48 and 336.26

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Solution

The fourth proportional to 985.61, 1,478.48 and 336.26 is: 504.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.61 : 1,478.48 = 336.26 : x
  2. Step 2: Convert to fraction form
    985.61/1,478.48 = 336.26/x
  3. Step 3: Cross multiply
    985.61x = 1,478.48 × 336.26
  4. Step 4: Simplify right side
    985.61x = 497,144.61
  5. Step 5: Solve for x
    x = 497,144.61/985.61
  6. Step 6: Final answer
    x = 504.41

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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.