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Finding the Fourth Proportional to 1,141.58, 1,710.68 and 621.86

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Solution

The fourth proportional to 1,141.58, 1,710.68 and 621.86 is: 931.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.58 : 1,710.68 = 621.86 : x
  2. Step 2: Convert to fraction form
    1,141.58/1,710.68 = 621.86/x
  3. Step 3: Cross multiply
    1,141.58x = 1,710.68 × 621.86
  4. Step 4: Simplify right side
    1,141.58x = 1,063,791.80
  5. Step 5: Solve for x
    x = 1,063,791.80/1,141.58
  6. Step 6: Final answer
    x = 931.86

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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.