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Finding the Fourth Proportional to 1,354.85, 1,868.45 and 856.61

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Solution

The fourth proportional to 1,354.85, 1,868.45 and 856.61 is: 1,181.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.85 : 1,868.45 = 856.61 : x
  2. Step 2: Convert to fraction form
    1,354.85/1,868.45 = 856.61/x
  3. Step 3: Cross multiply
    1,354.85x = 1,868.45 × 856.61
  4. Step 4: Simplify right side
    1,354.85x = 1,600,519.33
  5. Step 5: Solve for x
    x = 1,600,519.33/1,354.85
  6. Step 6: Final answer
    x = 1,181.33

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1.5x scale

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.