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Finding the Fourth Proportional to 942.87, 1,300.68 and 648.30

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Solution

The fourth proportional to 942.87, 1,300.68 and 648.30 is: 894.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.87 : 1,300.68 = 648.30 : x
  2. Step 2: Convert to fraction form
    942.87/1,300.68 = 648.30/x
  3. Step 3: Cross multiply
    942.87x = 1,300.68 × 648.30
  4. Step 4: Simplify right side
    942.87x = 843,230.84
  5. Step 5: Solve for x
    x = 843,230.84/942.87
  6. Step 6: Final answer
    x = 894.32

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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.