Home / 1,290.70-1,936.38-510.76

Finding the Fourth Proportional to 1,290.70, 1,936.38 and 510.76

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Solution

The fourth proportional to 1,290.70, 1,936.38 and 510.76 is: 766.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.70 : 1,936.38 = 510.76 : x
  2. Step 2: Convert to fraction form
    1,290.70/1,936.38 = 510.76/x
  3. Step 3: Cross multiply
    1,290.70x = 1,936.38 × 510.76
  4. Step 4: Simplify right side
    1,290.70x = 989,025.45
  5. Step 5: Solve for x
    x = 989,025.45/1,290.70
  6. Step 6: Final answer
    x = 766.27

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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.