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Finding the Fourth Proportional to 803.46, 1,108.09 and 617.40

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Solution

The fourth proportional to 803.46, 1,108.09 and 617.40 is: 851.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.46 : 1,108.09 = 617.40 : x
  2. Step 2: Convert to fraction form
    803.46/1,108.09 = 617.40/x
  3. Step 3: Cross multiply
    803.46x = 1,108.09 × 617.40
  4. Step 4: Simplify right side
    803.46x = 684,134.77
  5. Step 5: Solve for x
    x = 684,134.77/803.46
  6. Step 6: Final answer
    x = 851.49

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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.