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Finding the Fourth Proportional to 955.52, 1,318.32 and 645.20

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Solution

The fourth proportional to 955.52, 1,318.32 and 645.20 is: 890.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.52 : 1,318.32 = 645.20 : x
  2. Step 2: Convert to fraction form
    955.52/1,318.32 = 645.20/x
  3. Step 3: Cross multiply
    955.52x = 1,318.32 × 645.20
  4. Step 4: Simplify right side
    955.52x = 850,580.06
  5. Step 5: Solve for x
    x = 850,580.06/955.52
  6. Step 6: Final answer
    x = 890.18

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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.