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Finding the Fourth Proportional to 889.57, 1,329.25 and 641.58

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Solution

The fourth proportional to 889.57, 1,329.25 and 641.58 is: 958.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.57 : 1,329.25 = 641.58 : x
  2. Step 2: Convert to fraction form
    889.57/1,329.25 = 641.58/x
  3. Step 3: Cross multiply
    889.57x = 1,329.25 × 641.58
  4. Step 4: Simplify right side
    889.57x = 852,820.22
  5. Step 5: Solve for x
    x = 852,820.22/889.57
  6. Step 6: Final answer
    x = 958.69

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1.5x scale

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.