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Finding the Fourth Proportional to 661,571.58, 991,438.02 and 345,397.80

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Solution

The fourth proportional to 661,571.58, 991,438.02 and 345,397.80 is: 517,616.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,571.58 : 991,438.02 = 345,397.80 : x
  2. Step 2: Convert to fraction form
    661,571.58/991,438.02 = 345,397.80/x
  3. Step 3: Cross multiply
    661,571.58x = 991,438.02 × 345,397.80
  4. Step 4: Simplify right side
    661,571.58x = 342,440,510,944.36
  5. Step 5: Solve for x
    x = 342,440,510,944.36/661,571.58
  6. Step 6: Final answer
    x = 517,616.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.