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Finding the Fourth Proportional to 1,126.86, 1,690.43 and 386.27

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Solution

The fourth proportional to 1,126.86, 1,690.43 and 386.27 is: 579.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.86 : 1,690.43 = 386.27 : x
  2. Step 2: Convert to fraction form
    1,126.86/1,690.43 = 386.27/x
  3. Step 3: Cross multiply
    1,126.86x = 1,690.43 × 386.27
  4. Step 4: Simplify right side
    1,126.86x = 652,953.27
  5. Step 5: Solve for x
    x = 652,953.27/1,126.86
  6. Step 6: Final answer
    x = 579.45

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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.