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Finding the Fourth Proportional to 716,441.49, 988,689.25 and 394,144.67

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Solution

The fourth proportional to 716,441.49, 988,689.25 and 394,144.67 is: 543,919.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,441.49 : 988,689.25 = 394,144.67 : x
  2. Step 2: Convert to fraction form
    716,441.49/988,689.25 = 394,144.67/x
  3. Step 3: Cross multiply
    716,441.49x = 988,689.25 × 394,144.67
  4. Step 4: Simplify right side
    716,441.49x = 389,686,598,173.80
  5. Step 5: Solve for x
    x = 389,686,598,173.80/716,441.49
  6. Step 6: Final answer
    x = 543,919.64

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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.