Home / 1,421.68-2,131.08-554.80

Finding the Fourth Proportional to 1,421.68, 2,131.08 and 554.80

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Solution

The fourth proportional to 1,421.68, 2,131.08 and 554.80 is: 831.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.68 : 2,131.08 = 554.80 : x
  2. Step 2: Convert to fraction form
    1,421.68/2,131.08 = 554.80/x
  3. Step 3: Cross multiply
    1,421.68x = 2,131.08 × 554.80
  4. Step 4: Simplify right side
    1,421.68x = 1,182,323.18
  5. Step 5: Solve for x
    x = 1,182,323.18/1,421.68
  6. Step 6: Final answer
    x = 831.64

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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.