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Finding the Fourth Proportional to 821.60, 1,232.40 and 359.30

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Solution

The fourth proportional to 821.60, 1,232.40 and 359.30 is: 538.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.60 : 1,232.40 = 359.30 : x
  2. Step 2: Convert to fraction form
    821.60/1,232.40 = 359.30/x
  3. Step 3: Cross multiply
    821.60x = 1,232.40 × 359.30
  4. Step 4: Simplify right side
    821.60x = 442,801.32
  5. Step 5: Solve for x
    x = 442,801.32/821.60
  6. Step 6: Final answer
    x = 538.95

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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.