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Finding the Fourth Proportional to 902, 1,353.18 and 389

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Solution

The fourth proportional to 902, 1,353.18 and 389 is: 583.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    902 : 1,353.18 = 389 : x
  2. Step 2: Convert to fraction form
    902/1,353.18 = 389/x
  3. Step 3: Cross multiply
    902x = 1,353.18 × 389
  4. Step 4: Simplify right side
    902x = 526,387.02
  5. Step 5: Solve for x
    x = 526,387.02/902
  6. Step 6: Final answer
    x = 583.58

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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.