Home / 1,370.24-1,890.60-780.56

Finding the Fourth Proportional to 1,370.24, 1,890.60 and 780.56

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Solution

The fourth proportional to 1,370.24, 1,890.60 and 780.56 is: 1,076.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.24 : 1,890.60 = 780.56 : x
  2. Step 2: Convert to fraction form
    1,370.24/1,890.60 = 780.56/x
  3. Step 3: Cross multiply
    1,370.24x = 1,890.60 × 780.56
  4. Step 4: Simplify right side
    1,370.24x = 1,475,726.74
  5. Step 5: Solve for x
    x = 1,475,726.74/1,370.24
  6. Step 6: Final answer
    x = 1,076.98

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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.