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Finding the Fourth Proportional to 851.90, 1,272.11 and 846.78

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Solution

The fourth proportional to 851.90, 1,272.11 and 846.78 is: 1,264.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.90 : 1,272.11 = 846.78 : x
  2. Step 2: Convert to fraction form
    851.90/1,272.11 = 846.78/x
  3. Step 3: Cross multiply
    851.90x = 1,272.11 × 846.78
  4. Step 4: Simplify right side
    851.90x = 1,077,193.07
  5. Step 5: Solve for x
    x = 1,077,193.07/851.90
  6. Step 6: Final answer
    x = 1,264.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.