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Finding the Fourth Proportional to 955.77, 1,318.80 and 641.55

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Solution

The fourth proportional to 955.77, 1,318.80 and 641.55 is: 885.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.77 : 1,318.80 = 641.55 : x
  2. Step 2: Convert to fraction form
    955.77/1,318.80 = 641.55/x
  3. Step 3: Cross multiply
    955.77x = 1,318.80 × 641.55
  4. Step 4: Simplify right side
    955.77x = 846,079.88
  5. Step 5: Solve for x
    x = 846,079.88/955.77
  6. Step 6: Final answer
    x = 885.24

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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.