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Finding the Fourth Proportional to 1,127.01, 1,690.42 and 386.56

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Solution

The fourth proportional to 1,127.01, 1,690.42 and 386.56 is: 579.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.01 : 1,690.42 = 386.56 : x
  2. Step 2: Convert to fraction form
    1,127.01/1,690.42 = 386.56/x
  3. Step 3: Cross multiply
    1,127.01x = 1,690.42 × 386.56
  4. Step 4: Simplify right side
    1,127.01x = 653,448.76
  5. Step 5: Solve for x
    x = 653,448.76/1,127.01
  6. Step 6: Final answer
    x = 579.81

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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.