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Finding the Fourth Proportional to 538.80, 807.72 and 355.80

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Solution

The fourth proportional to 538.80, 807.72 and 355.80 is: 533.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.80 : 807.72 = 355.80 : x
  2. Step 2: Convert to fraction form
    538.80/807.72 = 355.80/x
  3. Step 3: Cross multiply
    538.80x = 807.72 × 355.80
  4. Step 4: Simplify right side
    538.80x = 287,386.78
  5. Step 5: Solve for x
    x = 287,386.78/538.80
  6. Step 6: Final answer
    x = 533.38

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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.