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Finding the Fourth Proportional to 756.23, 1,128.79 and 703.35

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Solution

The fourth proportional to 756.23, 1,128.79 and 703.35 is: 1,049.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.23 : 1,128.79 = 703.35 : x
  2. Step 2: Convert to fraction form
    756.23/1,128.79 = 703.35/x
  3. Step 3: Cross multiply
    756.23x = 1,128.79 × 703.35
  4. Step 4: Simplify right side
    756.23x = 793,934.45
  5. Step 5: Solve for x
    x = 793,934.45/756.23
  6. Step 6: Final answer
    x = 1,049.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.