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Finding the Fourth Proportional to 955.40, 1,317.78 and 689.84

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Solution

The fourth proportional to 955.40, 1,317.78 and 689.84 is: 951.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.40 : 1,317.78 = 689.84 : x
  2. Step 2: Convert to fraction form
    955.40/1,317.78 = 689.84/x
  3. Step 3: Cross multiply
    955.40x = 1,317.78 × 689.84
  4. Step 4: Simplify right side
    955.40x = 909,057.36
  5. Step 5: Solve for x
    x = 909,057.36/955.40
  6. Step 6: Final answer
    x = 951.49

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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.