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Finding the Fourth Proportional to 1,086.16, 1,630.60 and 869.48

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Solution

The fourth proportional to 1,086.16, 1,630.60 and 869.48 is: 1,305.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.16 : 1,630.60 = 869.48 : x
  2. Step 2: Convert to fraction form
    1,086.16/1,630.60 = 869.48/x
  3. Step 3: Cross multiply
    1,086.16x = 1,630.60 × 869.48
  4. Step 4: Simplify right side
    1,086.16x = 1,417,774.09
  5. Step 5: Solve for x
    x = 1,417,774.09/1,086.16
  6. Step 6: Final answer
    x = 1,305.31

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1.5x scale

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.