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Finding the Fourth Proportional to 713.64, 986.70 and 631.56

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Solution

The fourth proportional to 713.64, 986.70 and 631.56 is: 873.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.64 : 986.70 = 631.56 : x
  2. Step 2: Convert to fraction form
    713.64/986.70 = 631.56/x
  3. Step 3: Cross multiply
    713.64x = 986.70 × 631.56
  4. Step 4: Simplify right side
    713.64x = 623,160.25
  5. Step 5: Solve for x
    x = 623,160.25/713.64
  6. Step 6: Final answer
    x = 873.21

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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.