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Finding the Fourth Proportional to 387.80, 579.15 and 336.60

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Solution

The fourth proportional to 387.80, 579.15 and 336.60 is: 502.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.80 : 579.15 = 336.60 : x
  2. Step 2: Convert to fraction form
    387.80/579.15 = 336.60/x
  3. Step 3: Cross multiply
    387.80x = 579.15 × 336.60
  4. Step 4: Simplify right side
    387.80x = 194,941.89
  5. Step 5: Solve for x
    x = 194,941.89/387.80
  6. Step 6: Final answer
    x = 502.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.