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Finding the Fourth Proportional to 1,145.31, 1,717.65 and 442.36

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Solution

The fourth proportional to 1,145.31, 1,717.65 and 442.36 is: 663.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.31 : 1,717.65 = 442.36 : x
  2. Step 2: Convert to fraction form
    1,145.31/1,717.65 = 442.36/x
  3. Step 3: Cross multiply
    1,145.31x = 1,717.65 × 442.36
  4. Step 4: Simplify right side
    1,145.31x = 759,821.49
  5. Step 5: Solve for x
    x = 759,821.49/1,145.31
  6. Step 6: Final answer
    x = 663.42

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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.