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Finding the Fourth Proportional to 1,005.48, 1,385.91 and 710.37

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Solution

The fourth proportional to 1,005.48, 1,385.91 and 710.37 is: 979.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.48 : 1,385.91 = 710.37 : x
  2. Step 2: Convert to fraction form
    1,005.48/1,385.91 = 710.37/x
  3. Step 3: Cross multiply
    1,005.48x = 1,385.91 × 710.37
  4. Step 4: Simplify right side
    1,005.48x = 984,508.89
  5. Step 5: Solve for x
    x = 984,508.89/1,005.48
  6. Step 6: Final answer
    x = 979.14

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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.