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Finding the Fourth Proportional to 1,126.71, 1,554.93 and 684.65

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Solution

The fourth proportional to 1,126.71, 1,554.93 and 684.65 is: 944.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.71 : 1,554.93 = 684.65 : x
  2. Step 2: Convert to fraction form
    1,126.71/1,554.93 = 684.65/x
  3. Step 3: Cross multiply
    1,126.71x = 1,554.93 × 684.65
  4. Step 4: Simplify right side
    1,126.71x = 1,064,586.71
  5. Step 5: Solve for x
    x = 1,064,586.71/1,126.71
  6. Step 6: Final answer
    x = 944.86

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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.