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Finding the Fourth Proportional to 972.56, 1,340.88 and 622.64

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Solution

The fourth proportional to 972.56, 1,340.88 and 622.64 is: 858.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.56 : 1,340.88 = 622.64 : x
  2. Step 2: Convert to fraction form
    972.56/1,340.88 = 622.64/x
  3. Step 3: Cross multiply
    972.56x = 1,340.88 × 622.64
  4. Step 4: Simplify right side
    972.56x = 834,885.52
  5. Step 5: Solve for x
    x = 834,885.52/972.56
  6. Step 6: Final answer
    x = 858.44

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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.