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Finding the Fourth Proportional to 388.77, 582.12 and 342.64

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Solution

The fourth proportional to 388.77, 582.12 and 342.64 is: 513.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.77 : 582.12 = 342.64 : x
  2. Step 2: Convert to fraction form
    388.77/582.12 = 342.64/x
  3. Step 3: Cross multiply
    388.77x = 582.12 × 342.64
  4. Step 4: Simplify right side
    388.77x = 199,457.60
  5. Step 5: Solve for x
    x = 199,457.60/388.77
  6. Step 6: Final answer
    x = 513.05

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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.