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Finding the Fourth Proportional to 947.84, 1,419.36 and 639.36

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Solution

The fourth proportional to 947.84, 1,419.36 and 639.36 is: 957.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.84 : 1,419.36 = 639.36 : x
  2. Step 2: Convert to fraction form
    947.84/1,419.36 = 639.36/x
  3. Step 3: Cross multiply
    947.84x = 1,419.36 × 639.36
  4. Step 4: Simplify right side
    947.84x = 907,482.01
  5. Step 5: Solve for x
    x = 907,482.01/947.84
  6. Step 6: Final answer
    x = 957.42

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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.