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Finding the Fourth Proportional to 1,126.92, 1,554.48 and 678.65

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Solution

The fourth proportional to 1,126.92, 1,554.48 and 678.65 is: 936.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.92 : 1,554.48 = 678.65 : x
  2. Step 2: Convert to fraction form
    1,126.92/1,554.48 = 678.65/x
  3. Step 3: Cross multiply
    1,126.92x = 1,554.48 × 678.65
  4. Step 4: Simplify right side
    1,126.92x = 1,054,947.85
  5. Step 5: Solve for x
    x = 1,054,947.85/1,126.92
  6. Step 6: Final answer
    x = 936.13

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1.5x scale

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.