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Finding the Fourth Proportional to 1,354.77, 1,869.57 and 857.70

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Solution

The fourth proportional to 1,354.77, 1,869.57 and 857.70 is: 1,183.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.77 : 1,869.57 = 857.70 : x
  2. Step 2: Convert to fraction form
    1,354.77/1,869.57 = 857.70/x
  3. Step 3: Cross multiply
    1,354.77x = 1,869.57 × 857.70
  4. Step 4: Simplify right side
    1,354.77x = 1,603,530.19
  5. Step 5: Solve for x
    x = 1,603,530.19/1,354.77
  6. Step 6: Final answer
    x = 1,183.62

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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.