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Finding the Fourth Proportional to 648.99, 900.19 and 625.64

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Solution

The fourth proportional to 648.99, 900.19 and 625.64 is: 867.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.99 : 900.19 = 625.64 : x
  2. Step 2: Convert to fraction form
    648.99/900.19 = 625.64/x
  3. Step 3: Cross multiply
    648.99x = 900.19 × 625.64
  4. Step 4: Simplify right side
    648.99x = 563,194.87
  5. Step 5: Solve for x
    x = 563,194.87/648.99
  6. Step 6: Final answer
    x = 867.80

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.