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Finding the Fourth Proportional to 1,141.86, 1,575.45 and 716.55

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Solution

The fourth proportional to 1,141.86, 1,575.45 and 716.55 is: 988.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.86 : 1,575.45 = 716.55 : x
  2. Step 2: Convert to fraction form
    1,141.86/1,575.45 = 716.55/x
  3. Step 3: Cross multiply
    1,141.86x = 1,575.45 × 716.55
  4. Step 4: Simplify right side
    1,141.86x = 1,128,882.79
  5. Step 5: Solve for x
    x = 1,128,882.79/1,141.86
  6. Step 6: Final answer
    x = 988.63

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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.