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Finding the Fourth Proportional to 1,986.42, 2,979.48 and 525.54

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Solution

The fourth proportional to 1,986.42, 2,979.48 and 525.54 is: 788.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.42 : 2,979.48 = 525.54 : x
  2. Step 2: Convert to fraction form
    1,986.42/2,979.48 = 525.54/x
  3. Step 3: Cross multiply
    1,986.42x = 2,979.48 × 525.54
  4. Step 4: Simplify right side
    1,986.42x = 1,565,822.34
  5. Step 5: Solve for x
    x = 1,565,822.34/1,986.42
  6. Step 6: Final answer
    x = 788.27

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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.