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Finding the Fourth Proportional to 813.04, 1,217.73 and 487.72

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Solution

The fourth proportional to 813.04, 1,217.73 and 487.72 is: 730.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.04 : 1,217.73 = 487.72 : x
  2. Step 2: Convert to fraction form
    813.04/1,217.73 = 487.72/x
  3. Step 3: Cross multiply
    813.04x = 1,217.73 × 487.72
  4. Step 4: Simplify right side
    813.04x = 593,914.63
  5. Step 5: Solve for x
    x = 593,914.63/813.04
  6. Step 6: Final answer
    x = 730.49

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