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Finding the Fourth Proportional to 509.47, 764.30 and 216.96

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Solution

The fourth proportional to 509.47, 764.30 and 216.96 is: 325.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.47 : 764.30 = 216.96 : x
  2. Step 2: Convert to fraction form
    509.47/764.30 = 216.96/x
  3. Step 3: Cross multiply
    509.47x = 764.30 × 216.96
  4. Step 4: Simplify right side
    509.47x = 165,822.19
  5. Step 5: Solve for x
    x = 165,822.19/509.47
  6. Step 6: Final answer
    x = 325.48

Related Problems

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Half scale
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Double scale
Find fourth proportional to 510.47, 765.80 and 217.96
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.