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Finding the Fourth Proportional to 695.68, 1,045.44 and 388

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Solution

The fourth proportional to 695.68, 1,045.44 and 388 is: 583.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.68 : 1,045.44 = 388 : x
  2. Step 2: Convert to fraction form
    695.68/1,045.44 = 388/x
  3. Step 3: Cross multiply
    695.68x = 1,045.44 × 388
  4. Step 4: Simplify right side
    695.68x = 405,630.72
  5. Step 5: Solve for x
    x = 405,630.72/695.68
  6. Step 6: Final answer
    x = 583.07

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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.