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Finding the Fourth Proportional to 1,345.78, 2,018.79 and 371.89

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Solution

The fourth proportional to 1,345.78, 2,018.79 and 371.89 is: 557.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.78 : 2,018.79 = 371.89 : x
  2. Step 2: Convert to fraction form
    1,345.78/2,018.79 = 371.89/x
  3. Step 3: Cross multiply
    1,345.78x = 2,018.79 × 371.89
  4. Step 4: Simplify right side
    1,345.78x = 750,770.34
  5. Step 5: Solve for x
    x = 750,770.34/1,345.78
  6. Step 6: Final answer
    x = 557.87

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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.