Home / 1,438.45-2,157.60-572.15

Finding the Fourth Proportional to 1,438.45, 2,157.60 and 572.15

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Solution

The fourth proportional to 1,438.45, 2,157.60 and 572.15 is: 858.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.45 : 2,157.60 = 572.15 : x
  2. Step 2: Convert to fraction form
    1,438.45/2,157.60 = 572.15/x
  3. Step 3: Cross multiply
    1,438.45x = 2,157.60 × 572.15
  4. Step 4: Simplify right side
    1,438.45x = 1,234,470.84
  5. Step 5: Solve for x
    x = 1,234,470.84/1,438.45
  6. Step 6: Final answer
    x = 858.20

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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.