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Finding the Fourth Proportional to 1,021.78, 1,532.45 and 328.51

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Solution

The fourth proportional to 1,021.78, 1,532.45 and 328.51 is: 492.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.78 : 1,532.45 = 328.51 : x
  2. Step 2: Convert to fraction form
    1,021.78/1,532.45 = 328.51/x
  3. Step 3: Cross multiply
    1,021.78x = 1,532.45 × 328.51
  4. Step 4: Simplify right side
    1,021.78x = 503,422.14
  5. Step 5: Solve for x
    x = 503,422.14/1,021.78
  6. Step 6: Final answer
    x = 492.69

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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.