Home / 1,289.80-1,933.98-520.36

Finding the Fourth Proportional to 1,289.80, 1,933.98 and 520.36

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Solution

The fourth proportional to 1,289.80, 1,933.98 and 520.36 is: 780.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.80 : 1,933.98 = 520.36 : x
  2. Step 2: Convert to fraction form
    1,289.80/1,933.98 = 520.36/x
  3. Step 3: Cross multiply
    1,289.80x = 1,933.98 × 520.36
  4. Step 4: Simplify right side
    1,289.80x = 1,006,365.83
  5. Step 5: Solve for x
    x = 1,006,365.83/1,289.80
  6. Step 6: Final answer
    x = 780.25

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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.