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Finding the Fourth Proportional to 1,205.02, 1,662.78 and 707.80

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Solution

The fourth proportional to 1,205.02, 1,662.78 and 707.80 is: 976.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.02 : 1,662.78 = 707.80 : x
  2. Step 2: Convert to fraction form
    1,205.02/1,662.78 = 707.80/x
  3. Step 3: Cross multiply
    1,205.02x = 1,662.78 × 707.80
  4. Step 4: Simplify right side
    1,205.02x = 1,176,915.68
  5. Step 5: Solve for x
    x = 1,176,915.68/1,205.02
  6. Step 6: Final answer
    x = 976.68

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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.