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Finding the Fourth Proportional to 645.69, 891.02 and 365.94

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Solution

The fourth proportional to 645.69, 891.02 and 365.94 is: 504.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.69 : 891.02 = 365.94 : x
  2. Step 2: Convert to fraction form
    645.69/891.02 = 365.94/x
  3. Step 3: Cross multiply
    645.69x = 891.02 × 365.94
  4. Step 4: Simplify right side
    645.69x = 326,059.86
  5. Step 5: Solve for x
    x = 326,059.86/645.69
  6. Step 6: Final answer
    x = 504.98

Related Problems

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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.