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Finding the Fourth Proportional to 942.20, 1,298.88 and 661.56

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Solution

The fourth proportional to 942.20, 1,298.88 and 661.56 is: 912.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.20 : 1,298.88 = 661.56 : x
  2. Step 2: Convert to fraction form
    942.20/1,298.88 = 661.56/x
  3. Step 3: Cross multiply
    942.20x = 1,298.88 × 661.56
  4. Step 4: Simplify right side
    942.20x = 859,287.05
  5. Step 5: Solve for x
    x = 859,287.05/942.20
  6. Step 6: Final answer
    x = 912.00

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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.