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Finding the Fourth Proportional to 845.68, 1,268.80 and 359.20

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Solution

The fourth proportional to 845.68, 1,268.80 and 359.20 is: 538.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.68 : 1,268.80 = 359.20 : x
  2. Step 2: Convert to fraction form
    845.68/1,268.80 = 359.20/x
  3. Step 3: Cross multiply
    845.68x = 1,268.80 × 359.20
  4. Step 4: Simplify right side
    845.68x = 455,752.96
  5. Step 5: Solve for x
    x = 455,752.96/845.68
  6. Step 6: Final answer
    x = 538.92

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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.