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Finding the Fourth Proportional to 712.92, 983.66 and 491.80

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Solution

The fourth proportional to 712.92, 983.66 and 491.80 is: 678.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.92 : 983.66 = 491.80 : x
  2. Step 2: Convert to fraction form
    712.92/983.66 = 491.80/x
  3. Step 3: Cross multiply
    712.92x = 983.66 × 491.80
  4. Step 4: Simplify right side
    712.92x = 483,763.99
  5. Step 5: Solve for x
    x = 483,763.99/712.92
  6. Step 6: Final answer
    x = 678.57

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Similar ratio
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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.