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Finding the Fourth Proportional to 645.38, 889.85 and 545.62

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Solution

The fourth proportional to 645.38, 889.85 and 545.62 is: 752.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.38 : 889.85 = 545.62 : x
  2. Step 2: Convert to fraction form
    645.38/889.85 = 545.62/x
  3. Step 3: Cross multiply
    645.38x = 889.85 × 545.62
  4. Step 4: Simplify right side
    645.38x = 485,515.00
  5. Step 5: Solve for x
    x = 485,515.00/645.38
  6. Step 6: Final answer
    x = 752.29

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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.