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Finding the Fourth Proportional to 1,126.56, 1,689.98 and 386.32

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Solution

The fourth proportional to 1,126.56, 1,689.98 and 386.32 is: 579.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.56 : 1,689.98 = 386.32 : x
  2. Step 2: Convert to fraction form
    1,126.56/1,689.98 = 386.32/x
  3. Step 3: Cross multiply
    1,126.56x = 1,689.98 × 386.32
  4. Step 4: Simplify right side
    1,126.56x = 652,864.62
  5. Step 5: Solve for x
    x = 652,864.62/1,126.56
  6. Step 6: Final answer
    x = 579.52

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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.