Home / 1,421.30-2,131.62-543.48

Finding the Fourth Proportional to 1,421.30, 2,131.62 and 543.48

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Solution

The fourth proportional to 1,421.30, 2,131.62 and 543.48 is: 815.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.30 : 2,131.62 = 543.48 : x
  2. Step 2: Convert to fraction form
    1,421.30/2,131.62 = 543.48/x
  3. Step 3: Cross multiply
    1,421.30x = 2,131.62 × 543.48
  4. Step 4: Simplify right side
    1,421.30x = 1,158,500.79
  5. Step 5: Solve for x
    x = 1,158,500.79/1,421.30
  6. Step 6: Final answer
    x = 815.10

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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.