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Finding the Fourth Proportional to 1,213.47, 1,820.21 and 433.26

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Solution

The fourth proportional to 1,213.47, 1,820.21 and 433.26 is: 649.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.47 : 1,820.21 = 433.26 : x
  2. Step 2: Convert to fraction form
    1,213.47/1,820.21 = 433.26/x
  3. Step 3: Cross multiply
    1,213.47x = 1,820.21 × 433.26
  4. Step 4: Simplify right side
    1,213.47x = 788,624.18
  5. Step 5: Solve for x
    x = 788,624.18/1,213.47
  6. Step 6: Final answer
    x = 649.89

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.