Home / 1,405.40-2,106.20-1,079.16

Finding the Fourth Proportional to 1,405.40, 2,106.20 and 1,079.16

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Solution

The fourth proportional to 1,405.40, 2,106.20 and 1,079.16 is: 1,617.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.40 : 2,106.20 = 1,079.16 : x
  2. Step 2: Convert to fraction form
    1,405.40/2,106.20 = 1,079.16/x
  3. Step 3: Cross multiply
    1,405.40x = 2,106.20 × 1,079.16
  4. Step 4: Simplify right side
    1,405.40x = 2,272,926.79
  5. Step 5: Solve for x
    x = 2,272,926.79/1,405.40
  6. Step 6: Final answer
    x = 1,617.28

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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.