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Finding the Fourth Proportional to 664.30, 991.54 and 623.26

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Solution

The fourth proportional to 664.30, 991.54 and 623.26 is: 930.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.30 : 991.54 = 623.26 : x
  2. Step 2: Convert to fraction form
    664.30/991.54 = 623.26/x
  3. Step 3: Cross multiply
    664.30x = 991.54 × 623.26
  4. Step 4: Simplify right side
    664.30x = 617,987.22
  5. Step 5: Solve for x
    x = 617,987.22/664.30
  6. Step 6: Final answer
    x = 930.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.