Home / 1,421.45-2,132.17-842.57

Finding the Fourth Proportional to 1,421.45, 2,132.17 and 842.57

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Solution

The fourth proportional to 1,421.45, 2,132.17 and 842.57 is: 1,263.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.45 : 2,132.17 = 842.57 : x
  2. Step 2: Convert to fraction form
    1,421.45/2,132.17 = 842.57/x
  3. Step 3: Cross multiply
    1,421.45x = 2,132.17 × 842.57
  4. Step 4: Simplify right side
    1,421.45x = 1,796,489.71
  5. Step 5: Solve for x
    x = 1,796,489.71/1,421.45
  6. Step 6: Final answer
    x = 1,263.85

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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.