Home / 1,086.48-1,629.68-780.89

Finding the Fourth Proportional to 1,086.48, 1,629.68 and 780.89

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Solution

The fourth proportional to 1,086.48, 1,629.68 and 780.89 is: 1,171.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.48 : 1,629.68 = 780.89 : x
  2. Step 2: Convert to fraction form
    1,086.48/1,629.68 = 780.89/x
  3. Step 3: Cross multiply
    1,086.48x = 1,629.68 × 780.89
  4. Step 4: Simplify right side
    1,086.48x = 1,272,588.76
  5. Step 5: Solve for x
    x = 1,272,588.76/1,086.48
  6. Step 6: Final answer
    x = 1,171.30

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1.5x scale

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.