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Finding the Fourth Proportional to 646.88, 971.48 and 620.78

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Solution

The fourth proportional to 646.88, 971.48 and 620.78 is: 932.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.88 : 971.48 = 620.78 : x
  2. Step 2: Convert to fraction form
    646.88/971.48 = 620.78/x
  3. Step 3: Cross multiply
    646.88x = 971.48 × 620.78
  4. Step 4: Simplify right side
    646.88x = 603,075.35
  5. Step 5: Solve for x
    x = 603,075.35/646.88
  6. Step 6: Final answer
    x = 932.28

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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.