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Finding the Fourth Proportional to 645.13, 890.28 and 365.38

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Solution

The fourth proportional to 645.13, 890.28 and 365.38 is: 504.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.13 : 890.28 = 365.38 : x
  2. Step 2: Convert to fraction form
    645.13/890.28 = 365.38/x
  3. Step 3: Cross multiply
    645.13x = 890.28 × 365.38
  4. Step 4: Simplify right side
    645.13x = 325,290.51
  5. Step 5: Solve for x
    x = 325,290.51/645.13
  6. Step 6: Final answer
    x = 504.22

Related Problems

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Half scale
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Double scale
Find fourth proportional to 646.13, 891.66 and 366.38
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.