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Finding the Fourth Proportional to 904.11, 1,247.65 and 554.79

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Solution

The fourth proportional to 904.11, 1,247.65 and 554.79 is: 765.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.11 : 1,247.65 = 554.79 : x
  2. Step 2: Convert to fraction form
    904.11/1,247.65 = 554.79/x
  3. Step 3: Cross multiply
    904.11x = 1,247.65 × 554.79
  4. Step 4: Simplify right side
    904.11x = 692,183.74
  5. Step 5: Solve for x
    x = 692,183.74/904.11
  6. Step 6: Final answer
    x = 765.60

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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.