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Finding the Fourth Proportional to 912.30, 1,365.40 and 661.10

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Solution

The fourth proportional to 912.30, 1,365.40 and 661.10 is: 989.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.30 : 1,365.40 = 661.10 : x
  2. Step 2: Convert to fraction form
    912.30/1,365.40 = 661.10/x
  3. Step 3: Cross multiply
    912.30x = 1,365.40 × 661.10
  4. Step 4: Simplify right side
    912.30x = 902,659.11
  5. Step 5: Solve for x
    x = 902,659.11/912.30
  6. Step 6: Final answer
    x = 989.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.