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Finding the Fourth Proportional to 890.57, 1,328.81 and 885.41

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Solution

The fourth proportional to 890.57, 1,328.81 and 885.41 is: 1,321.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.57 : 1,328.81 = 885.41 : x
  2. Step 2: Convert to fraction form
    890.57/1,328.81 = 885.41/x
  3. Step 3: Cross multiply
    890.57x = 1,328.81 × 885.41
  4. Step 4: Simplify right side
    890.57x = 1,176,535.57
  5. Step 5: Solve for x
    x = 1,176,535.57/890.57
  6. Step 6: Final answer
    x = 1,321.10

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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.