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Finding the Fourth Proportional to 860.44, 1,291.26 and 644.58

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Solution

The fourth proportional to 860.44, 1,291.26 and 644.58 is: 967.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.44 : 1,291.26 = 644.58 : x
  2. Step 2: Convert to fraction form
    860.44/1,291.26 = 644.58/x
  3. Step 3: Cross multiply
    860.44x = 1,291.26 × 644.58
  4. Step 4: Simplify right side
    860.44x = 832,320.37
  5. Step 5: Solve for x
    x = 832,320.37/860.44
  6. Step 6: Final answer
    x = 967.32

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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.