Home / 1,405.16-2,107.10-721.64

Finding the Fourth Proportional to 1,405.16, 2,107.10 and 721.64

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Solution

The fourth proportional to 1,405.16, 2,107.10 and 721.64 is: 1,082.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.16 : 2,107.10 = 721.64 : x
  2. Step 2: Convert to fraction form
    1,405.16/2,107.10 = 721.64/x
  3. Step 3: Cross multiply
    1,405.16x = 2,107.10 × 721.64
  4. Step 4: Simplify right side
    1,405.16x = 1,520,567.64
  5. Step 5: Solve for x
    x = 1,520,567.64/1,405.16
  6. Step 6: Final answer
    x = 1,082.13

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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.