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Finding the Fourth Proportional to 804.21, 1,108.60 and 555.11

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Solution

The fourth proportional to 804.21, 1,108.60 and 555.11 is: 765.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.21 : 1,108.60 = 555.11 : x
  2. Step 2: Convert to fraction form
    804.21/1,108.60 = 555.11/x
  3. Step 3: Cross multiply
    804.21x = 1,108.60 × 555.11
  4. Step 4: Simplify right side
    804.21x = 615,394.95
  5. Step 5: Solve for x
    x = 615,394.95/804.21
  6. Step 6: Final answer
    x = 765.22

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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.