Home / 1,421.67-2,131.29-555.78

Finding the Fourth Proportional to 1,421.67, 2,131.29 and 555.78

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Solution

The fourth proportional to 1,421.67, 2,131.29 and 555.78 is: 833.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.67 : 2,131.29 = 555.78 : x
  2. Step 2: Convert to fraction form
    1,421.67/2,131.29 = 555.78/x
  3. Step 3: Cross multiply
    1,421.67x = 2,131.29 × 555.78
  4. Step 4: Simplify right side
    1,421.67x = 1,184,528.36
  5. Step 5: Solve for x
    x = 1,184,528.36/1,421.67
  6. Step 6: Final answer
    x = 833.20

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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.