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Finding the Fourth Proportional to 963.78, 1,330.20 and 632.08

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Solution

The fourth proportional to 963.78, 1,330.20 and 632.08 is: 872.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.78 : 1,330.20 = 632.08 : x
  2. Step 2: Convert to fraction form
    963.78/1,330.20 = 632.08/x
  3. Step 3: Cross multiply
    963.78x = 1,330.20 × 632.08
  4. Step 4: Simplify right side
    963.78x = 840,792.82
  5. Step 5: Solve for x
    x = 840,792.82/963.78
  6. Step 6: Final answer
    x = 872.39

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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.