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Finding the Fourth Proportional to 1,563.51, 2,345.16 and 638.58

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Solution

The fourth proportional to 1,563.51, 2,345.16 and 638.58 is: 957.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.51 : 2,345.16 = 638.58 : x
  2. Step 2: Convert to fraction form
    1,563.51/2,345.16 = 638.58/x
  3. Step 3: Cross multiply
    1,563.51x = 2,345.16 × 638.58
  4. Step 4: Simplify right side
    1,563.51x = 1,497,572.27
  5. Step 5: Solve for x
    x = 1,497,572.27/1,563.51
  6. Step 6: Final answer
    x = 957.83

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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.