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Finding the Fourth Proportional to 1,126.65, 1,554.21 and 753.65

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Solution

The fourth proportional to 1,126.65, 1,554.21 and 753.65 is: 1,039.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.65 : 1,554.21 = 753.65 : x
  2. Step 2: Convert to fraction form
    1,126.65/1,554.21 = 753.65/x
  3. Step 3: Cross multiply
    1,126.65x = 1,554.21 × 753.65
  4. Step 4: Simplify right side
    1,126.65x = 1,171,322.60
  5. Step 5: Solve for x
    x = 1,171,322.60/1,126.65
  6. Step 6: Final answer
    x = 1,039.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.