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Finding the Fourth Proportional to 499.57, 689.18 and 381.51

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Solution

The fourth proportional to 499.57, 689.18 and 381.51 is: 526.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.57 : 689.18 = 381.51 : x
  2. Step 2: Convert to fraction form
    499.57/689.18 = 381.51/x
  3. Step 3: Cross multiply
    499.57x = 689.18 × 381.51
  4. Step 4: Simplify right side
    499.57x = 262,927.15
  5. Step 5: Solve for x
    x = 262,927.15/499.57
  6. Step 6: Final answer
    x = 526.31

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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.