Home / 1,421.01-2,131.50-775.83

Finding the Fourth Proportional to 1,421.01, 2,131.50 and 775.83

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Solution

The fourth proportional to 1,421.01, 2,131.50 and 775.83 is: 1,163.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.01 : 2,131.50 = 775.83 : x
  2. Step 2: Convert to fraction form
    1,421.01/2,131.50 = 775.83/x
  3. Step 3: Cross multiply
    1,421.01x = 2,131.50 × 775.83
  4. Step 4: Simplify right side
    1,421.01x = 1,653,681.65
  5. Step 5: Solve for x
    x = 1,653,681.65/1,421.01
  6. Step 6: Final answer
    x = 1,163.74

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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.