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Finding the Fourth Proportional to 955.53, 1,319.28 and 690.44

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Solution

The fourth proportional to 955.53, 1,319.28 and 690.44 is: 953.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.53 : 1,319.28 = 690.44 : x
  2. Step 2: Convert to fraction form
    955.53/1,319.28 = 690.44/x
  3. Step 3: Cross multiply
    955.53x = 1,319.28 × 690.44
  4. Step 4: Simplify right side
    955.53x = 910,883.68
  5. Step 5: Solve for x
    x = 910,883.68/955.53
  6. Step 6: Final answer
    x = 953.28

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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.