Home / 1,387.28-1,914.36-1,220.24

Finding the Fourth Proportional to 1,387.28, 1,914.36 and 1,220.24

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Solution

The fourth proportional to 1,387.28, 1,914.36 and 1,220.24 is: 1,683.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.28 : 1,914.36 = 1,220.24 : x
  2. Step 2: Convert to fraction form
    1,387.28/1,914.36 = 1,220.24/x
  3. Step 3: Cross multiply
    1,387.28x = 1,914.36 × 1,220.24
  4. Step 4: Simplify right side
    1,387.28x = 2,335,978.65
  5. Step 5: Solve for x
    x = 2,335,978.65/1,387.28
  6. Step 6: Final answer
    x = 1,683.86

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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.