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Finding the Fourth Proportional to 1,287.12, 1,777.10 and 845.77

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Solution

The fourth proportional to 1,287.12, 1,777.10 and 845.77 is: 1,167.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.12 : 1,777.10 = 845.77 : x
  2. Step 2: Convert to fraction form
    1,287.12/1,777.10 = 845.77/x
  3. Step 3: Cross multiply
    1,287.12x = 1,777.10 × 845.77
  4. Step 4: Simplify right side
    1,287.12x = 1,503,017.87
  5. Step 5: Solve for x
    x = 1,503,017.87/1,287.12
  6. Step 6: Final answer
    x = 1,167.74

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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.