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Finding the Fourth Proportional to 1,142.78, 1,713.56 and 362.45

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Solution

The fourth proportional to 1,142.78, 1,713.56 and 362.45 is: 543.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.78 : 1,713.56 = 362.45 : x
  2. Step 2: Convert to fraction form
    1,142.78/1,713.56 = 362.45/x
  3. Step 3: Cross multiply
    1,142.78x = 1,713.56 × 362.45
  4. Step 4: Simplify right side
    1,142.78x = 621,079.82
  5. Step 5: Solve for x
    x = 621,079.82/1,142.78
  6. Step 6: Final answer
    x = 543.48

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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.