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Finding the Fourth Proportional to 904.64, 1,248.39 and 490.64

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Solution

The fourth proportional to 904.64, 1,248.39 and 490.64 is: 677.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.64 : 1,248.39 = 490.64 : x
  2. Step 2: Convert to fraction form
    904.64/1,248.39 = 490.64/x
  3. Step 3: Cross multiply
    904.64x = 1,248.39 × 490.64
  4. Step 4: Simplify right side
    904.64x = 612,503.83
  5. Step 5: Solve for x
    x = 612,503.83/904.64
  6. Step 6: Final answer
    x = 677.07

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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.