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Finding the Fourth Proportional to 1,233.78, 1,702.90 and 709.98

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Solution

The fourth proportional to 1,233.78, 1,702.90 and 709.98 is: 979.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,233.78 : 1,702.90 = 709.98 : x
  2. Step 2: Convert to fraction form
    1,233.78/1,702.90 = 709.98/x
  3. Step 3: Cross multiply
    1,233.78x = 1,702.90 × 709.98
  4. Step 4: Simplify right side
    1,233.78x = 1,209,024.94
  5. Step 5: Solve for x
    x = 1,209,024.94/1,233.78
  6. Step 6: Final answer
    x = 979.94

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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.