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Finding the Fourth Proportional to 1,620.40, 2,431.32 and 580.72

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Solution

The fourth proportional to 1,620.40, 2,431.32 and 580.72 is: 871.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.40 : 2,431.32 = 580.72 : x
  2. Step 2: Convert to fraction form
    1,620.40/2,431.32 = 580.72/x
  3. Step 3: Cross multiply
    1,620.40x = 2,431.32 × 580.72
  4. Step 4: Simplify right side
    1,620.40x = 1,411,916.15
  5. Step 5: Solve for x
    x = 1,411,916.15/1,620.40
  6. Step 6: Final answer
    x = 871.34

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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.