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Finding the Fourth Proportional to 955, 1,317.18 and 660.76

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Solution

The fourth proportional to 955, 1,317.18 and 660.76 is: 911.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    955 : 1,317.18 = 660.76 : x
  2. Step 2: Convert to fraction form
    955/1,317.18 = 660.76/x
  3. Step 3: Cross multiply
    955x = 1,317.18 × 660.76
  4. Step 4: Simplify right side
    955x = 870,339.86
  5. Step 5: Solve for x
    x = 870,339.86/955
  6. Step 6: Final answer
    x = 911.35

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Double scale
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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.