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Finding the Fourth Proportional to 851.41, 1,275.99 and 543.13

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Solution

The fourth proportional to 851.41, 1,275.99 and 543.13 is: 813.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.41 : 1,275.99 = 543.13 : x
  2. Step 2: Convert to fraction form
    851.41/1,275.99 = 543.13/x
  3. Step 3: Cross multiply
    851.41x = 1,275.99 × 543.13
  4. Step 4: Simplify right side
    851.41x = 693,028.45
  5. Step 5: Solve for x
    x = 693,028.45/851.41
  6. Step 6: Final answer
    x = 813.98

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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.