Home / 1,287.12-1,778.04-1,024.80

Finding the Fourth Proportional to 1,287.12, 1,778.04 and 1,024.80

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Solution

The fourth proportional to 1,287.12, 1,778.04 and 1,024.80 is: 1,415.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.12 : 1,778.04 = 1,024.80 : x
  2. Step 2: Convert to fraction form
    1,287.12/1,778.04 = 1,024.80/x
  3. Step 3: Cross multiply
    1,287.12x = 1,778.04 × 1,024.80
  4. Step 4: Simplify right side
    1,287.12x = 1,822,135.39
  5. Step 5: Solve for x
    x = 1,822,135.39/1,287.12
  6. Step 6: Final answer
    x = 1,415.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.