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Finding the Fourth Proportional to 568.31, 855.80 and 511.20

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Solution

The fourth proportional to 568.31, 855.80 and 511.20 is: 769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.31 : 855.80 = 511.20 : x
  2. Step 2: Convert to fraction form
    568.31/855.80 = 511.20/x
  3. Step 3: Cross multiply
    568.31x = 855.80 × 511.20
  4. Step 4: Simplify right side
    568.31x = 437,482.40
  5. Step 5: Solve for x
    x = 437,482.40/568.31
  6. Step 6: Final answer
    x = 769.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.