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Finding the Fourth Proportional to 651.78, 969.44 and 631.40

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Solution

The fourth proportional to 651.78, 969.44 and 631.40 is: 939.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.78 : 969.44 = 631.40 : x
  2. Step 2: Convert to fraction form
    651.78/969.44 = 631.40/x
  3. Step 3: Cross multiply
    651.78x = 969.44 × 631.40
  4. Step 4: Simplify right side
    651.78x = 612,096.41
  5. Step 5: Solve for x
    x = 612,096.41/651.78
  6. Step 6: Final answer
    x = 939.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.