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Finding the Fourth Proportional to 801.68, 1,201.80 and 431.68

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Solution

The fourth proportional to 801.68, 1,201.80 and 431.68 is: 647.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.68 : 1,201.80 = 431.68 : x
  2. Step 2: Convert to fraction form
    801.68/1,201.80 = 431.68/x
  3. Step 3: Cross multiply
    801.68x = 1,201.80 × 431.68
  4. Step 4: Simplify right side
    801.68x = 518,790.87
  5. Step 5: Solve for x
    x = 518,790.87/801.68
  6. Step 6: Final answer
    x = 647.13

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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.