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Finding the Fourth Proportional to 783.46, 1,081.21 and 514.19

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Solution

The fourth proportional to 783.46, 1,081.21 and 514.19 is: 709.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.46 : 1,081.21 = 514.19 : x
  2. Step 2: Convert to fraction form
    783.46/1,081.21 = 514.19/x
  3. Step 3: Cross multiply
    783.46x = 1,081.21 × 514.19
  4. Step 4: Simplify right side
    783.46x = 555,947.37
  5. Step 5: Solve for x
    x = 555,947.37/783.46
  6. Step 6: Final answer
    x = 709.61

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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.