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Finding the Fourth Proportional to 889.77, 1,325.91 and 860.41

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Solution

The fourth proportional to 889.77, 1,325.91 and 860.41 is: 1,282.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.77 : 1,325.91 = 860.41 : x
  2. Step 2: Convert to fraction form
    889.77/1,325.91 = 860.41/x
  3. Step 3: Cross multiply
    889.77x = 1,325.91 × 860.41
  4. Step 4: Simplify right side
    889.77x = 1,140,826.22
  5. Step 5: Solve for x
    x = 1,140,826.22/889.77
  6. Step 6: Final answer
    x = 1,282.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.