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Finding the Fourth Proportional to 499.28, 689.01 and 302.81

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Solution

The fourth proportional to 499.28, 689.01 and 302.81 is: 417.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.28 : 689.01 = 302.81 : x
  2. Step 2: Convert to fraction form
    499.28/689.01 = 302.81/x
  3. Step 3: Cross multiply
    499.28x = 689.01 × 302.81
  4. Step 4: Simplify right side
    499.28x = 208,639.12
  5. Step 5: Solve for x
    x = 208,639.12/499.28
  6. Step 6: Final answer
    x = 417.88

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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.