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Finding the Fourth Proportional to 1,563.48, 2,345.31 and 639.45

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Solution

The fourth proportional to 1,563.48, 2,345.31 and 639.45 is: 959.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.48 : 2,345.31 = 639.45 : x
  2. Step 2: Convert to fraction form
    1,563.48/2,345.31 = 639.45/x
  3. Step 3: Cross multiply
    1,563.48x = 2,345.31 × 639.45
  4. Step 4: Simplify right side
    1,563.48x = 1,499,708.48
  5. Step 5: Solve for x
    x = 1,499,708.48/1,563.48
  6. Step 6: Final answer
    x = 959.21

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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.