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Finding the Fourth Proportional to 985.48, 1,478.21 and 254.99

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Solution

The fourth proportional to 985.48, 1,478.21 and 254.99 is: 382.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.48 : 1,478.21 = 254.99 : x
  2. Step 2: Convert to fraction form
    985.48/1,478.21 = 254.99/x
  3. Step 3: Cross multiply
    985.48x = 1,478.21 × 254.99
  4. Step 4: Simplify right side
    985.48x = 376,928.77
  5. Step 5: Solve for x
    x = 376,928.77/985.48
  6. Step 6: Final answer
    x = 382.48

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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.