Home / 1,387.20-1,914.26-757.70

Finding the Fourth Proportional to 1,387.20, 1,914.26 and 757.70

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Solution

The fourth proportional to 1,387.20, 1,914.26 and 757.70 is: 1,045.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.20 : 1,914.26 = 757.70 : x
  2. Step 2: Convert to fraction form
    1,387.20/1,914.26 = 757.70/x
  3. Step 3: Cross multiply
    1,387.20x = 1,914.26 × 757.70
  4. Step 4: Simplify right side
    1,387.20x = 1,450,434.80
  5. Step 5: Solve for x
    x = 1,450,434.80/1,387.20
  6. Step 6: Final answer
    x = 1,045.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.