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Finding the Fourth Proportional to 800.07, 1,200.20 and 435.39

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Solution

The fourth proportional to 800.07, 1,200.20 and 435.39 is: 653.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.07 : 1,200.20 = 435.39 : x
  2. Step 2: Convert to fraction form
    800.07/1,200.20 = 435.39/x
  3. Step 3: Cross multiply
    800.07x = 1,200.20 × 435.39
  4. Step 4: Simplify right side
    800.07x = 522,552.90
  5. Step 5: Solve for x
    x = 522,552.90/800.07
  6. Step 6: Final answer
    x = 653.13

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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.