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Finding the Fourth Proportional to 955.78, 1,317.54 and 661.66

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Solution

The fourth proportional to 955.78, 1,317.54 and 661.66 is: 912.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.78 : 1,317.54 = 661.66 : x
  2. Step 2: Convert to fraction form
    955.78/1,317.54 = 661.66/x
  3. Step 3: Cross multiply
    955.78x = 1,317.54 × 661.66
  4. Step 4: Simplify right side
    955.78x = 871,763.52
  5. Step 5: Solve for x
    x = 871,763.52/955.78
  6. Step 6: Final answer
    x = 912.10

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1.5x scale

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.