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Finding the Fourth Proportional to 1,938.75, 2,908.13 and 784.50

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Solution

The fourth proportional to 1,938.75, 2,908.13 and 784.50 is: 1,176.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.75 : 2,908.13 = 784.50 : x
  2. Step 2: Convert to fraction form
    1,938.75/2,908.13 = 784.50/x
  3. Step 3: Cross multiply
    1,938.75x = 2,908.13 × 784.50
  4. Step 4: Simplify right side
    1,938.75x = 2,281,424.06
  5. Step 5: Solve for x
    x = 2,281,424.06/1,938.75
  6. Step 6: Final answer
    x = 1,176.75

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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.