Home / 1,421.90-2,134.20-1,216.70

Finding the Fourth Proportional to 1,421.90, 2,134.20 and 1,216.70

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Solution

The fourth proportional to 1,421.90, 2,134.20 and 1,216.70 is: 1,826.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.90 : 2,134.20 = 1,216.70 : x
  2. Step 2: Convert to fraction form
    1,421.90/2,134.20 = 1,216.70/x
  3. Step 3: Cross multiply
    1,421.90x = 2,134.20 × 1,216.70
  4. Step 4: Simplify right side
    1,421.90x = 2,596,681.14
  5. Step 5: Solve for x
    x = 2,596,681.14/1,421.90
  6. Step 6: Final answer
    x = 1,826.21

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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.