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Finding the Fourth Proportional to 985.56, 1,478.40 and 255.16

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Solution

The fourth proportional to 985.56, 1,478.40 and 255.16 is: 382.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.56 : 1,478.40 = 255.16 : x
  2. Step 2: Convert to fraction form
    985.56/1,478.40 = 255.16/x
  3. Step 3: Cross multiply
    985.56x = 1,478.40 × 255.16
  4. Step 4: Simplify right side
    985.56x = 377,228.54
  5. Step 5: Solve for x
    x = 377,228.54/985.56
  6. Step 6: Final answer
    x = 382.76

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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.