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Finding the Fourth Proportional to 1,114.86, 1,672.31 and 345.38

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Solution

The fourth proportional to 1,114.86, 1,672.31 and 345.38 is: 518.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.86 : 1,672.31 = 345.38 : x
  2. Step 2: Convert to fraction form
    1,114.86/1,672.31 = 345.38/x
  3. Step 3: Cross multiply
    1,114.86x = 1,672.31 × 345.38
  4. Step 4: Simplify right side
    1,114.86x = 577,582.43
  5. Step 5: Solve for x
    x = 577,582.43/1,114.86
  6. Step 6: Final answer
    x = 518.08

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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.