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Finding the Fourth Proportional to 645.69, 890.11 and 424.25

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Solution

The fourth proportional to 645.69, 890.11 and 424.25 is: 584.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.69 : 890.11 = 424.25 : x
  2. Step 2: Convert to fraction form
    645.69/890.11 = 424.25/x
  3. Step 3: Cross multiply
    645.69x = 890.11 × 424.25
  4. Step 4: Simplify right side
    645.69x = 377,629.17
  5. Step 5: Solve for x
    x = 377,629.17/645.69
  6. Step 6: Final answer
    x = 584.85

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Half scale
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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.