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Finding the Fourth Proportional to 519.90, 780.00 and 259.59

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Solution

The fourth proportional to 519.90, 780.00 and 259.59 is: 389.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.90 : 780.00 = 259.59 : x
  2. Step 2: Convert to fraction form
    519.90/780.00 = 259.59/x
  3. Step 3: Cross multiply
    519.90x = 780.00 × 259.59
  4. Step 4: Simplify right side
    519.90x = 202,477.76
  5. Step 5: Solve for x
    x = 202,477.76/519.90
  6. Step 6: Final answer
    x = 389.45

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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.