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Finding the Fourth Proportional to 890.43, 1,228.71 and 517.41

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Solution

The fourth proportional to 890.43, 1,228.71 and 517.41 is: 713.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.43 : 1,228.71 = 517.41 : x
  2. Step 2: Convert to fraction form
    890.43/1,228.71 = 517.41/x
  3. Step 3: Cross multiply
    890.43x = 1,228.71 × 517.41
  4. Step 4: Simplify right side
    890.43x = 635,746.84
  5. Step 5: Solve for x
    x = 635,746.84/890.43
  6. Step 6: Final answer
    x = 713.98

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Double scale
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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.