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Finding the Fourth Proportional to 1,438, 2,157.90 and 572.38

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Solution

The fourth proportional to 1,438, 2,157.90 and 572.38 is: 858.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438 : 2,157.90 = 572.38 : x
  2. Step 2: Convert to fraction form
    1,438/2,157.90 = 572.38/x
  3. Step 3: Cross multiply
    1,438x = 2,157.90 × 572.38
  4. Step 4: Simplify right side
    1,438x = 1,235,138.80
  5. Step 5: Solve for x
    x = 1,235,138.80/1,438
  6. Step 6: Final answer
    x = 858.93

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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.