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Finding the Fourth Proportional to 857.63, 1,188.92 and 810.86

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Solution

The fourth proportional to 857.63, 1,188.92 and 810.86 is: 1,124.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.63 : 1,188.92 = 810.86 : x
  2. Step 2: Convert to fraction form
    857.63/1,188.92 = 810.86/x
  3. Step 3: Cross multiply
    857.63x = 1,188.92 × 810.86
  4. Step 4: Simplify right side
    857.63x = 964,037.67
  5. Step 5: Solve for x
    x = 964,037.67/857.63
  6. Step 6: Final answer
    x = 1,124.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.