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Finding the Fourth Proportional to 808.64, 1,211.28 and 603.56

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Solution

The fourth proportional to 808.64, 1,211.28 and 603.56 is: 904.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.64 : 1,211.28 = 603.56 : x
  2. Step 2: Convert to fraction form
    808.64/1,211.28 = 603.56/x
  3. Step 3: Cross multiply
    808.64x = 1,211.28 × 603.56
  4. Step 4: Simplify right side
    808.64x = 731,080.16
  5. Step 5: Solve for x
    x = 731,080.16/808.64
  6. Step 6: Final answer
    x = 904.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.