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Finding the Fourth Proportional to 1,954.80, 2,932.40 and 638.50

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Solution

The fourth proportional to 1,954.80, 2,932.40 and 638.50 is: 957.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,954.80 : 2,932.40 = 638.50 : x
  2. Step 2: Convert to fraction form
    1,954.80/2,932.40 = 638.50/x
  3. Step 3: Cross multiply
    1,954.80x = 2,932.40 × 638.50
  4. Step 4: Simplify right side
    1,954.80x = 1,872,337.40
  5. Step 5: Solve for x
    x = 1,872,337.40/1,954.80
  6. Step 6: Final answer
    x = 957.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.