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Finding the Fourth Proportional to 920.48, 1,268.30 and 625.24

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Solution

The fourth proportional to 920.48, 1,268.30 and 625.24 is: 861.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.48 : 1,268.30 = 625.24 : x
  2. Step 2: Convert to fraction form
    920.48/1,268.30 = 625.24/x
  3. Step 3: Cross multiply
    920.48x = 1,268.30 × 625.24
  4. Step 4: Simplify right side
    920.48x = 792,991.89
  5. Step 5: Solve for x
    x = 792,991.89/920.48
  6. Step 6: Final answer
    x = 861.50

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1.5x scale

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.