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Finding the Fourth Proportional to 1,563.78, 2,345.64 and 639.12

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Solution

The fourth proportional to 1,563.78, 2,345.64 and 639.12 is: 958.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.78 : 2,345.64 = 639.12 : x
  2. Step 2: Convert to fraction form
    1,563.78/2,345.64 = 639.12/x
  3. Step 3: Cross multiply
    1,563.78x = 2,345.64 × 639.12
  4. Step 4: Simplify right side
    1,563.78x = 1,499,145.44
  5. Step 5: Solve for x
    x = 1,499,145.44/1,563.78
  6. Step 6: Final answer
    x = 958.67

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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.