Home / 1,421.28-2,131.28-555.36

Finding the Fourth Proportional to 1,421.28, 2,131.28 and 555.36

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Solution

The fourth proportional to 1,421.28, 2,131.28 and 555.36 is: 832.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.28 : 2,131.28 = 555.36 : x
  2. Step 2: Convert to fraction form
    1,421.28/2,131.28 = 555.36/x
  3. Step 3: Cross multiply
    1,421.28x = 2,131.28 × 555.36
  4. Step 4: Simplify right side
    1,421.28x = 1,183,627.66
  5. Step 5: Solve for x
    x = 1,183,627.66/1,421.28
  6. Step 6: Final answer
    x = 832.79

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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.