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Finding the Fourth Proportional to 1,986.17, 2,979.20 and 525.33

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Solution

The fourth proportional to 1,986.17, 2,979.20 and 525.33 is: 787.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.17 : 2,979.20 = 525.33 : x
  2. Step 2: Convert to fraction form
    1,986.17/2,979.20 = 525.33/x
  3. Step 3: Cross multiply
    1,986.17x = 2,979.20 × 525.33
  4. Step 4: Simplify right side
    1,986.17x = 1,565,063.14
  5. Step 5: Solve for x
    x = 1,565,063.14/1,986.17
  6. Step 6: Final answer
    x = 787.98

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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.