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Finding the Fourth Proportional to 985.54, 1,479.12 and 523.84

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Solution

The fourth proportional to 985.54, 1,479.12 and 523.84 is: 786.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.54 : 1,479.12 = 523.84 : x
  2. Step 2: Convert to fraction form
    985.54/1,479.12 = 523.84/x
  3. Step 3: Cross multiply
    985.54x = 1,479.12 × 523.84
  4. Step 4: Simplify right side
    985.54x = 774,822.22
  5. Step 5: Solve for x
    x = 774,822.22/985.54
  6. Step 6: Final answer
    x = 786.19

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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.