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Finding the Fourth Proportional to 1,177.75, 1,625.70 and 712

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Solution

The fourth proportional to 1,177.75, 1,625.70 and 712 is: 982.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,177.75 : 1,625.70 = 712 : x
  2. Step 2: Convert to fraction form
    1,177.75/1,625.70 = 712/x
  3. Step 3: Cross multiply
    1,177.75x = 1,625.70 × 712
  4. Step 4: Simplify right side
    1,177.75x = 1,157,498.40
  5. Step 5: Solve for x
    x = 1,157,498.40/1,177.75
  6. Step 6: Final answer
    x = 982.80

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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.