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Finding the Fourth Proportional to 803.10, 1,199.58 and 640.32

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Solution

The fourth proportional to 803.10, 1,199.58 and 640.32 is: 956.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.10 : 1,199.58 = 640.32 : x
  2. Step 2: Convert to fraction form
    803.10/1,199.58 = 640.32/x
  3. Step 3: Cross multiply
    803.10x = 1,199.58 × 640.32
  4. Step 4: Simplify right side
    803.10x = 768,115.07
  5. Step 5: Solve for x
    x = 768,115.07/803.10
  6. Step 6: Final answer
    x = 956.44

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.