Home / 1,457.21-2,011.28-868.20

Finding the Fourth Proportional to 1,457.21, 2,011.28 and 868.20

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Solution

The fourth proportional to 1,457.21, 2,011.28 and 868.20 is: 1,198.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,457.21 : 2,011.28 = 868.20 : x
  2. Step 2: Convert to fraction form
    1,457.21/2,011.28 = 868.20/x
  3. Step 3: Cross multiply
    1,457.21x = 2,011.28 × 868.20
  4. Step 4: Simplify right side
    1,457.21x = 1,746,188.96
  5. Step 5: Solve for x
    x = 1,746,188.96/1,457.21
  6. Step 6: Final answer
    x = 1,198.31

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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.