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Finding the Fourth Proportional to 1,026.24, 1,539.32 and 393

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Solution

The fourth proportional to 1,026.24, 1,539.32 and 393 is: 589.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,026.24 : 1,539.32 = 393 : x
  2. Step 2: Convert to fraction form
    1,026.24/1,539.32 = 393/x
  3. Step 3: Cross multiply
    1,026.24x = 1,539.32 × 393
  4. Step 4: Simplify right side
    1,026.24x = 604,952.76
  5. Step 5: Solve for x
    x = 604,952.76/1,026.24
  6. Step 6: Final answer
    x = 589.48

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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.