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Finding the Fourth Proportional to 1,438.42, 2,156.40 and 572.56

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Solution

The fourth proportional to 1,438.42, 2,156.40 and 572.56 is: 858.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.42 : 2,156.40 = 572.56 : x
  2. Step 2: Convert to fraction form
    1,438.42/2,156.40 = 572.56/x
  3. Step 3: Cross multiply
    1,438.42x = 2,156.40 × 572.56
  4. Step 4: Simplify right side
    1,438.42x = 1,234,668.38
  5. Step 5: Solve for x
    x = 1,234,668.38/1,438.42
  6. Step 6: Final answer
    x = 858.35

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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.