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Finding the Fourth Proportional to 955.09, 1,430.30 and 661.75

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Solution

The fourth proportional to 955.09, 1,430.30 and 661.75 is: 991.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.09 : 1,430.30 = 661.75 : x
  2. Step 2: Convert to fraction form
    955.09/1,430.30 = 661.75/x
  3. Step 3: Cross multiply
    955.09x = 1,430.30 × 661.75
  4. Step 4: Simplify right side
    955.09x = 946,499.10
  5. Step 5: Solve for x
    x = 946,499.10/955.09
  6. Step 6: Final answer
    x = 991.01

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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.