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Finding the Fourth Proportional to 987.06, 1,362.15 and 766.31

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Solution

The fourth proportional to 987.06, 1,362.15 and 766.31 is: 1,057.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.06 : 1,362.15 = 766.31 : x
  2. Step 2: Convert to fraction form
    987.06/1,362.15 = 766.31/x
  3. Step 3: Cross multiply
    987.06x = 1,362.15 × 766.31
  4. Step 4: Simplify right side
    987.06x = 1,043,822.36
  5. Step 5: Solve for x
    x = 1,043,822.36/987.06
  6. Step 6: Final answer
    x = 1,057.51

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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.