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Finding the Fourth Proportional to 1,312.92, 1,968.79 and 388.16

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Solution

The fourth proportional to 1,312.92, 1,968.79 and 388.16 is: 582.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.92 : 1,968.79 = 388.16 : x
  2. Step 2: Convert to fraction form
    1,312.92/1,968.79 = 388.16/x
  3. Step 3: Cross multiply
    1,312.92x = 1,968.79 × 388.16
  4. Step 4: Simplify right side
    1,312.92x = 764,205.53
  5. Step 5: Solve for x
    x = 764,205.53/1,312.92
  6. Step 6: Final answer
    x = 582.07

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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.