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Finding the Fourth Proportional to 510, 765.88 and 428.44

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Solution

The fourth proportional to 510, 765.88 and 428.44 is: 643.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    510 : 765.88 = 428.44 : x
  2. Step 2: Convert to fraction form
    510/765.88 = 428.44/x
  3. Step 3: Cross multiply
    510x = 765.88 × 428.44
  4. Step 4: Simplify right side
    510x = 328,133.63
  5. Step 5: Solve for x
    x = 328,133.63/510
  6. Step 6: Final answer
    x = 643.40

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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.