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Finding the Fourth Proportional to 499.23, 688.82 and 302.70

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Solution

The fourth proportional to 499.23, 688.82 and 302.70 is: 417.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.23 : 688.82 = 302.70 : x
  2. Step 2: Convert to fraction form
    499.23/688.82 = 302.70/x
  3. Step 3: Cross multiply
    499.23x = 688.82 × 302.70
  4. Step 4: Simplify right side
    499.23x = 208,500.86
  5. Step 5: Solve for x
    x = 208,500.86/499.23
  6. Step 6: Final answer
    x = 417.65

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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.