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Finding the Fourth Proportional to 955.35, 1,317.84 and 689.50

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Solution

The fourth proportional to 955.35, 1,317.84 and 689.50 is: 951.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.35 : 1,317.84 = 689.50 : x
  2. Step 2: Convert to fraction form
    955.35/1,317.84 = 689.50/x
  3. Step 3: Cross multiply
    955.35x = 1,317.84 × 689.50
  4. Step 4: Simplify right side
    955.35x = 908,642.33
  5. Step 5: Solve for x
    x = 908,642.33/955.35
  6. Step 6: Final answer
    x = 951.11

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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.