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Finding the Fourth Proportional to 890.88, 1,228.23 and 681.18

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Solution

The fourth proportional to 890.88, 1,228.23 and 681.18 is: 939.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.88 : 1,228.23 = 681.18 : x
  2. Step 2: Convert to fraction form
    890.88/1,228.23 = 681.18/x
  3. Step 3: Cross multiply
    890.88x = 1,228.23 × 681.18
  4. Step 4: Simplify right side
    890.88x = 836,645.71
  5. Step 5: Solve for x
    x = 836,645.71/890.88
  6. Step 6: Final answer
    x = 939.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.