Home / 1,421.20-2,131.80-1,075.60

Finding the Fourth Proportional to 1,421.20, 2,131.80 and 1,075.60

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Solution

The fourth proportional to 1,421.20, 2,131.80 and 1,075.60 is: 1,613.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.20 : 2,131.80 = 1,075.60 : x
  2. Step 2: Convert to fraction form
    1,421.20/2,131.80 = 1,075.60/x
  3. Step 3: Cross multiply
    1,421.20x = 2,131.80 × 1,075.60
  4. Step 4: Simplify right side
    1,421.20x = 2,292,964.08
  5. Step 5: Solve for x
    x = 2,292,964.08/1,421.20
  6. Step 6: Final answer
    x = 1,613.40

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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.