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Finding the Fourth Proportional to 1,005.13, 1,387.05 and 673.51

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Solution

The fourth proportional to 1,005.13, 1,387.05 and 673.51 is: 929.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.13 : 1,387.05 = 673.51 : x
  2. Step 2: Convert to fraction form
    1,005.13/1,387.05 = 673.51/x
  3. Step 3: Cross multiply
    1,005.13x = 1,387.05 × 673.51
  4. Step 4: Simplify right side
    1,005.13x = 934,192.05
  5. Step 5: Solve for x
    x = 934,192.05/1,005.13
  6. Step 6: Final answer
    x = 929.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.