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Finding the Fourth Proportional to 1,028.55, 1,541.85 and 856.63

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Solution

The fourth proportional to 1,028.55, 1,541.85 and 856.63 is: 1,284.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.55 : 1,541.85 = 856.63 : x
  2. Step 2: Convert to fraction form
    1,028.55/1,541.85 = 856.63/x
  3. Step 3: Cross multiply
    1,028.55x = 1,541.85 × 856.63
  4. Step 4: Simplify right side
    1,028.55x = 1,320,794.97
  5. Step 5: Solve for x
    x = 1,320,794.97/1,028.55
  6. Step 6: Final answer
    x = 1,284.13

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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.