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Finding the Fourth Proportional to 499.96, 689.95 and 290.18

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Solution

The fourth proportional to 499.96, 689.95 and 290.18 is: 400.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.96 : 689.95 = 290.18 : x
  2. Step 2: Convert to fraction form
    499.96/689.95 = 290.18/x
  3. Step 3: Cross multiply
    499.96x = 689.95 × 290.18
  4. Step 4: Simplify right side
    499.96x = 200,209.69
  5. Step 5: Solve for x
    x = 200,209.69/499.96
  6. Step 6: Final answer
    x = 400.45

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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.