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Finding the Fourth Proportional to 756.70, 1,133.70 and 648.70

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Solution

The fourth proportional to 756.70, 1,133.70 and 648.70 is: 971.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.70 : 1,133.70 = 648.70 : x
  2. Step 2: Convert to fraction form
    756.70/1,133.70 = 648.70/x
  3. Step 3: Cross multiply
    756.70x = 1,133.70 × 648.70
  4. Step 4: Simplify right side
    756.70x = 735,431.19
  5. Step 5: Solve for x
    x = 735,431.19/756.70
  6. Step 6: Final answer
    x = 971.89

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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.