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Finding the Fourth Proportional to 1,117.28, 1,675.76 and 386.69

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Solution

The fourth proportional to 1,117.28, 1,675.76 and 386.69 is: 579.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.28 : 1,675.76 = 386.69 : x
  2. Step 2: Convert to fraction form
    1,117.28/1,675.76 = 386.69/x
  3. Step 3: Cross multiply
    1,117.28x = 1,675.76 × 386.69
  4. Step 4: Simplify right side
    1,117.28x = 647,989.32
  5. Step 5: Solve for x
    x = 647,989.32/1,117.28
  6. Step 6: Final answer
    x = 579.97

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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.