Home / 1,438.32-2,157.06-821.91

Finding the Fourth Proportional to 1,438.32, 2,157.06 and 821.91

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Solution

The fourth proportional to 1,438.32, 2,157.06 and 821.91 is: 1,232.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.32 : 2,157.06 = 821.91 : x
  2. Step 2: Convert to fraction form
    1,438.32/2,157.06 = 821.91/x
  3. Step 3: Cross multiply
    1,438.32x = 2,157.06 × 821.91
  4. Step 4: Simplify right side
    1,438.32x = 1,772,909.18
  5. Step 5: Solve for x
    x = 1,772,909.18/1,438.32
  6. Step 6: Final answer
    x = 1,232.62

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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.