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Finding the Fourth Proportional to 645.69, 890.22 and 527.54

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Solution

The fourth proportional to 645.69, 890.22 and 527.54 is: 727.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.69 : 890.22 = 527.54 : x
  2. Step 2: Convert to fraction form
    645.69/890.22 = 527.54/x
  3. Step 3: Cross multiply
    645.69x = 890.22 × 527.54
  4. Step 4: Simplify right side
    645.69x = 469,626.66
  5. Step 5: Solve for x
    x = 469,626.66/645.69
  6. Step 6: Final answer
    x = 727.33

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Half scale
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Double scale
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Similar ratio
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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.