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Finding the Fourth Proportional to 500.67, 690.85 and 290.86

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Solution

The fourth proportional to 500.67, 690.85 and 290.86 is: 401.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.67 : 690.85 = 290.86 : x
  2. Step 2: Convert to fraction form
    500.67/690.85 = 290.86/x
  3. Step 3: Cross multiply
    500.67x = 690.85 × 290.86
  4. Step 4: Simplify right side
    500.67x = 200,940.63
  5. Step 5: Solve for x
    x = 200,940.63/500.67
  6. Step 6: Final answer
    x = 401.34

Related Problems

Find fourth proportional to 250.34, 345.43 and 145.43
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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.