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Finding the Fourth Proportional to 985.63, 1,478.45 and 336.35

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Solution

The fourth proportional to 985.63, 1,478.45 and 336.35 is: 504.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.63 : 1,478.45 = 336.35 : x
  2. Step 2: Convert to fraction form
    985.63/1,478.45 = 336.35/x
  3. Step 3: Cross multiply
    985.63x = 1,478.45 × 336.35
  4. Step 4: Simplify right side
    985.63x = 497,276.66
  5. Step 5: Solve for x
    x = 497,276.66/985.63
  6. Step 6: Final answer
    x = 504.53

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Double scale
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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.