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Finding the Fourth Proportional to 957.88, 1,320.98 and 638.72

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Solution

The fourth proportional to 957.88, 1,320.98 and 638.72 is: 880.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.88 : 1,320.98 = 638.72 : x
  2. Step 2: Convert to fraction form
    957.88/1,320.98 = 638.72/x
  3. Step 3: Cross multiply
    957.88x = 1,320.98 × 638.72
  4. Step 4: Simplify right side
    957.88x = 843,736.35
  5. Step 5: Solve for x
    x = 843,736.35/957.88
  6. Step 6: Final answer
    x = 880.84

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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.