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Finding the Fourth Proportional to 1,178.50, 1,626.48 and 712.75

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Solution

The fourth proportional to 1,178.50, 1,626.48 and 712.75 is: 983.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.50 : 1,626.48 = 712.75 : x
  2. Step 2: Convert to fraction form
    1,178.50/1,626.48 = 712.75/x
  3. Step 3: Cross multiply
    1,178.50x = 1,626.48 × 712.75
  4. Step 4: Simplify right side
    1,178.50x = 1,159,273.62
  5. Step 5: Solve for x
    x = 1,159,273.62/1,178.50
  6. Step 6: Final answer
    x = 983.69

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Double scale
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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.