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Finding the Fourth Proportional to 1,178.21, 1,767.99 and 630.69

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Solution

The fourth proportional to 1,178.21, 1,767.99 and 630.69 is: 946.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.21 : 1,767.99 = 630.69 : x
  2. Step 2: Convert to fraction form
    1,178.21/1,767.99 = 630.69/x
  3. Step 3: Cross multiply
    1,178.21x = 1,767.99 × 630.69
  4. Step 4: Simplify right side
    1,178.21x = 1,115,056.46
  5. Step 5: Solve for x
    x = 1,115,056.46/1,178.21
  6. Step 6: Final answer
    x = 946.40

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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.