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Finding the Fourth Proportional to 1,125.08, 1,687.80 and 638.36

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Solution

The fourth proportional to 1,125.08, 1,687.80 and 638.36 is: 957.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.08 : 1,687.80 = 638.36 : x
  2. Step 2: Convert to fraction form
    1,125.08/1,687.80 = 638.36/x
  3. Step 3: Cross multiply
    1,125.08x = 1,687.80 × 638.36
  4. Step 4: Simplify right side
    1,125.08x = 1,077,424.01
  5. Step 5: Solve for x
    x = 1,077,424.01/1,125.08
  6. Step 6: Final answer
    x = 957.64

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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.