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Finding the Fourth Proportional to 427, 639.69 and 340.51

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Solution

The fourth proportional to 427, 639.69 and 340.51 is: 510.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    427 : 639.69 = 340.51 : x
  2. Step 2: Convert to fraction form
    427/639.69 = 340.51/x
  3. Step 3: Cross multiply
    427x = 639.69 × 340.51
  4. Step 4: Simplify right side
    427x = 217,820.84
  5. Step 5: Solve for x
    x = 217,820.84/427
  6. Step 6: Final answer
    x = 510.12

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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.