Home / 1,621.12-2,238.72-1,386.88

Finding the Fourth Proportional to 1,621.12, 2,238.72 and 1,386.88

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Solution

The fourth proportional to 1,621.12, 2,238.72 and 1,386.88 is: 1,915.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.12 : 2,238.72 = 1,386.88 : x
  2. Step 2: Convert to fraction form
    1,621.12/2,238.72 = 1,386.88/x
  3. Step 3: Cross multiply
    1,621.12x = 2,238.72 × 1,386.88
  4. Step 4: Simplify right side
    1,621.12x = 3,104,835.99
  5. Step 5: Solve for x
    x = 3,104,835.99/1,621.12
  6. Step 6: Final answer
    x = 1,915.24

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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.