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Finding the Fourth Proportional to 857.03, 1,285.55 and 207.77

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Solution

The fourth proportional to 857.03, 1,285.55 and 207.77 is: 311.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.03 : 1,285.55 = 207.77 : x
  2. Step 2: Convert to fraction form
    857.03/1,285.55 = 207.77/x
  3. Step 3: Cross multiply
    857.03x = 1,285.55 × 207.77
  4. Step 4: Simplify right side
    857.03x = 267,091.26
  5. Step 5: Solve for x
    x = 267,091.26/857.03
  6. Step 6: Final answer
    x = 311.65

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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.