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Finding the Fourth Proportional to 499.95, 689.75 and 303.39

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Solution

The fourth proportional to 499.95, 689.75 and 303.39 is: 418.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.95 : 689.75 = 303.39 : x
  2. Step 2: Convert to fraction form
    499.95/689.75 = 303.39/x
  3. Step 3: Cross multiply
    499.95x = 689.75 × 303.39
  4. Step 4: Simplify right side
    499.95x = 209,263.25
  5. Step 5: Solve for x
    x = 209,263.25/499.95
  6. Step 6: Final answer
    x = 418.57

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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.