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Finding the Fourth Proportional to 623.20, 871.40 and 623.20

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Solution

The fourth proportional to 623.20, 871.40 and 623.20 is: 871.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.20 : 871.40 = 623.20 : x
  2. Step 2: Convert to fraction form
    623.20/871.40 = 623.20/x
  3. Step 3: Cross multiply
    623.20x = 871.40 × 623.20
  4. Step 4: Simplify right side
    623.20x = 543,056.48
  5. Step 5: Solve for x
    x = 543,056.48/623.20
  6. Step 6: Final answer
    x = 871.40

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.