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Finding the Fourth Proportional to 804.20, 1,110.65 and 655.22

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Solution

The fourth proportional to 804.20, 1,110.65 and 655.22 is: 904.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.20 : 1,110.65 = 655.22 : x
  2. Step 2: Convert to fraction form
    804.20/1,110.65 = 655.22/x
  3. Step 3: Cross multiply
    804.20x = 1,110.65 × 655.22
  4. Step 4: Simplify right side
    804.20x = 727,711.26
  5. Step 5: Solve for x
    x = 727,711.26/804.20
  6. Step 6: Final answer
    x = 904.89

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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.