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Finding the Fourth Proportional to 904.31, 1,247.78 and 555.11

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Solution

The fourth proportional to 904.31, 1,247.78 and 555.11 is: 765.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.31 : 1,247.78 = 555.11 : x
  2. Step 2: Convert to fraction form
    904.31/1,247.78 = 555.11/x
  3. Step 3: Cross multiply
    904.31x = 1,247.78 × 555.11
  4. Step 4: Simplify right side
    904.31x = 692,650.30
  5. Step 5: Solve for x
    x = 692,650.30/904.31
  6. Step 6: Final answer
    x = 765.95

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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.