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Finding the Fourth Proportional to 804.17, 1,109.08 and 638.12

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Solution

The fourth proportional to 804.17, 1,109.08 and 638.12 is: 880.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.17 : 1,109.08 = 638.12 : x
  2. Step 2: Convert to fraction form
    804.17/1,109.08 = 638.12/x
  3. Step 3: Cross multiply
    804.17x = 1,109.08 × 638.12
  4. Step 4: Simplify right side
    804.17x = 707,726.13
  5. Step 5: Solve for x
    x = 707,726.13/804.17
  6. Step 6: Final answer
    x = 880.07

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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.