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Finding the Fourth Proportional to 1,001.05, 1,382.68 and 707.62

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Solution

The fourth proportional to 1,001.05, 1,382.68 and 707.62 is: 977.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.05 : 1,382.68 = 707.62 : x
  2. Step 2: Convert to fraction form
    1,001.05/1,382.68 = 707.62/x
  3. Step 3: Cross multiply
    1,001.05x = 1,382.68 × 707.62
  4. Step 4: Simplify right side
    1,001.05x = 978,412.02
  5. Step 5: Solve for x
    x = 978,412.02/1,001.05
  6. Step 6: Final answer
    x = 977.39

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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.