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Finding the Fourth Proportional to 1,292.40, 1,933.80 and 772.68

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Solution

The fourth proportional to 1,292.40, 1,933.80 and 772.68 is: 1,156.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.40 : 1,933.80 = 772.68 : x
  2. Step 2: Convert to fraction form
    1,292.40/1,933.80 = 772.68/x
  3. Step 3: Cross multiply
    1,292.40x = 1,933.80 × 772.68
  4. Step 4: Simplify right side
    1,292.40x = 1,494,208.58
  5. Step 5: Solve for x
    x = 1,494,208.58/1,292.40
  6. Step 6: Final answer
    x = 1,156.15

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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.