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Finding the Fourth Proportional to 702.50, 971.04 and 640.12

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Solution

The fourth proportional to 702.50, 971.04 and 640.12 is: 884.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.50 : 971.04 = 640.12 : x
  2. Step 2: Convert to fraction form
    702.50/971.04 = 640.12/x
  3. Step 3: Cross multiply
    702.50x = 971.04 × 640.12
  4. Step 4: Simplify right side
    702.50x = 621,582.12
  5. Step 5: Solve for x
    x = 621,582.12/702.50
  6. Step 6: Final answer
    x = 884.81

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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.