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Finding the Fourth Proportional to 716,439.49, 988,686.50 and 394,142.67

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Solution

The fourth proportional to 716,439.49, 988,686.50 and 394,142.67 is: 543,916.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,439.49 : 988,686.50 = 394,142.67 : x
  2. Step 2: Convert to fraction form
    716,439.49/988,686.50 = 394,142.67/x
  3. Step 3: Cross multiply
    716,439.49x = 988,686.50 × 394,142.67
  4. Step 4: Simplify right side
    716,439.49x = 389,683,529,988.81
  5. Step 5: Solve for x
    x = 389,683,529,988.81/716,439.49
  6. Step 6: Final answer
    x = 543,916.88

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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.