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Finding the Fourth Proportional to 994.59, 1,492.29 and 345.78

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Solution

The fourth proportional to 994.59, 1,492.29 and 345.78 is: 518.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.59 : 1,492.29 = 345.78 : x
  2. Step 2: Convert to fraction form
    994.59/1,492.29 = 345.78/x
  3. Step 3: Cross multiply
    994.59x = 1,492.29 × 345.78
  4. Step 4: Simplify right side
    994.59x = 516,004.04
  5. Step 5: Solve for x
    x = 516,004.04/994.59
  6. Step 6: Final answer
    x = 518.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.