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Finding the Fourth Proportional to 1,128.03, 1,691.99 and 306.31

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Solution

The fourth proportional to 1,128.03, 1,691.99 and 306.31 is: 459.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.03 : 1,691.99 = 306.31 : x
  2. Step 2: Convert to fraction form
    1,128.03/1,691.99 = 306.31/x
  3. Step 3: Cross multiply
    1,128.03x = 1,691.99 × 306.31
  4. Step 4: Simplify right side
    1,128.03x = 518,267.26
  5. Step 5: Solve for x
    x = 518,267.26/1,128.03
  6. Step 6: Final answer
    x = 459.45

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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.