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Finding the Fourth Proportional to 1,405.46, 2,107.65 and 710.75

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Solution

The fourth proportional to 1,405.46, 2,107.65 and 710.75 is: 1,065.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.46 : 2,107.65 = 710.75 : x
  2. Step 2: Convert to fraction form
    1,405.46/2,107.65 = 710.75/x
  3. Step 3: Cross multiply
    1,405.46x = 2,107.65 × 710.75
  4. Step 4: Simplify right side
    1,405.46x = 1,498,012.24
  5. Step 5: Solve for x
    x = 1,498,012.24/1,405.46
  6. Step 6: Final answer
    x = 1,065.85

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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.