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Finding the Fourth Proportional to 1,085.94, 1,628.88 and 870.90

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Solution

The fourth proportional to 1,085.94, 1,628.88 and 870.90 is: 1,306.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.94 : 1,628.88 = 870.90 : x
  2. Step 2: Convert to fraction form
    1,085.94/1,628.88 = 870.90/x
  3. Step 3: Cross multiply
    1,085.94x = 1,628.88 × 870.90
  4. Step 4: Simplify right side
    1,085.94x = 1,418,591.59
  5. Step 5: Solve for x
    x = 1,418,591.59/1,085.94
  6. Step 6: Final answer
    x = 1,306.33

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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.