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Finding the Fourth Proportional to 500.30, 690.76 and 447.69

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Solution

The fourth proportional to 500.30, 690.76 and 447.69 is: 618.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.30 : 690.76 = 447.69 : x
  2. Step 2: Convert to fraction form
    500.30/690.76 = 447.69/x
  3. Step 3: Cross multiply
    500.30x = 690.76 × 447.69
  4. Step 4: Simplify right side
    500.30x = 309,246.34
  5. Step 5: Solve for x
    x = 309,246.34/500.30
  6. Step 6: Final answer
    x = 618.12

Related Problems

Find fourth proportional to 250.15, 345.38 and 223.85
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.