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Finding the Fourth Proportional to 380.72, 525.32 and 214.87

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Solution

The fourth proportional to 380.72, 525.32 and 214.87 is: 296.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.72 : 525.32 = 214.87 : x
  2. Step 2: Convert to fraction form
    380.72/525.32 = 214.87/x
  3. Step 3: Cross multiply
    380.72x = 525.32 × 214.87
  4. Step 4: Simplify right side
    380.72x = 112,875.51
  5. Step 5: Solve for x
    x = 112,875.51/380.72
  6. Step 6: Final answer
    x = 296.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.