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Finding the Fourth Proportional to 985.48, 1,478.20 and 255

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Solution

The fourth proportional to 985.48, 1,478.20 and 255 is: 382.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.48 : 1,478.20 = 255 : x
  2. Step 2: Convert to fraction form
    985.48/1,478.20 = 255/x
  3. Step 3: Cross multiply
    985.48x = 1,478.20 × 255
  4. Step 4: Simplify right side
    985.48x = 376,941
  5. Step 5: Solve for x
    x = 376,941/985.48
  6. Step 6: Final answer
    x = 382.49

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Double scale
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Similar ratio
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1.5x scale

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.