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Finding the Fourth Proportional to 904.25, 1,247.87 and 505.92

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Solution

The fourth proportional to 904.25, 1,247.87 and 505.92 is: 698.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.25 : 1,247.87 = 505.92 : x
  2. Step 2: Convert to fraction form
    904.25/1,247.87 = 505.92/x
  3. Step 3: Cross multiply
    904.25x = 1,247.87 × 505.92
  4. Step 4: Simplify right side
    904.25x = 631,322.39
  5. Step 5: Solve for x
    x = 631,322.39/904.25
  6. Step 6: Final answer
    x = 698.17

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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.