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Finding the Fourth Proportional to 352, 485.40 and 286.30

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Solution

The fourth proportional to 352, 485.40 and 286.30 is: 394.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    352 : 485.40 = 286.30 : x
  2. Step 2: Convert to fraction form
    352/485.40 = 286.30/x
  3. Step 3: Cross multiply
    352x = 485.40 × 286.30
  4. Step 4: Simplify right side
    352x = 138,970.02
  5. Step 5: Solve for x
    x = 138,970.02/352
  6. Step 6: Final answer
    x = 394.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.