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Finding the Fourth Proportional to 985.13, 1,477.72 and 254.70

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Solution

The fourth proportional to 985.13, 1,477.72 and 254.70 is: 382.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.13 : 1,477.72 = 254.70 : x
  2. Step 2: Convert to fraction form
    985.13/1,477.72 = 254.70/x
  3. Step 3: Cross multiply
    985.13x = 1,477.72 × 254.70
  4. Step 4: Simplify right side
    985.13x = 376,379.74
  5. Step 5: Solve for x
    x = 376,379.74/985.13
  6. Step 6: Final answer
    x = 382.06

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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.